GMC MotorHome, 1974 MotorHome User Manual

1973-1978 GMC Motorhome Information Page 1

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Internet Idiot’s Guide for

GMC MotorHome
Information

GARY BOVEE

[e-mail]

Revised July 2014

GMC MotorHome Information Page 2

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Internet Links to:

• A comprehensive look at the history of the 1973-1978 GMC Motorhome

• Purchasing a GMC Motorhome – Buyer’s Checklist

• Manuals, Wiring Diagrams, Floor Plans, Paint Codes, etc.

• Rebuilding the Olds 403 and 455

• GMC MotorHome Generator (Troubleshooting the Onan)

• GMC Motorhome Parts and Service Suppliers, Publication Listings and Service Parts Cross
References

• GMC Technical Information, GMC Photo Archive and GMC Motorhome Registry

• GMC Clubs Nationwide

• GMCnet – Your link to the GMC Community

• Black List – Indispensable list of folks willing to help in case of trouble on the road.

A CAD rendering of a 1974 GMC MotorHome

Revised July 2014

GMC MotorHome Information Page 3

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Preface

There is a vast amount of information available on the Internet about the GMC MotorHome
built from 1973 through 1978: History, how-to-repair info, suppliers, service and repair facilities,
service parts, clubs, vendors, etc. The problem is where to start searching without having to
spend hours surfing the Internet. Personally, as a newbie, I spent many hours looking on the
Internet for different types of GMC motorhome information and wished there was a concise
reference guide to this type of information. Since I could not find one, I decided to create my
own — 1973-1978 GMC MotorHome Information.

This Guide was specifically designed with the idea to save newbies time in searching for GMC
motorhome information that is readily available on the Internet. It is also a handy reference
guide for all GMCers who want to quickly find Internet links of GMC motorhome information.

A lot of GMCers travel with a computer in their coaches. I suggest you keep a copy of this guide
so you can take it with you on the road. Chapter 4 in the Guide lists GMC MotorHome
suppliers and service/repair facilities. In the event you do not have an internet connection you
will still be able to access business names, addresses, and phone numbers that may be very
helpful in case of a breakdown on the road.

Hopefully, this Guide will help you speed up your internet searches!

Happy travels!

Gary Bovee
1978 GMC Royale
Red Bluff, CA

DISCLAIMER:

Internet links listed in this document are intended solely for the purpose of communicating thoughts, ideas, opinions and procedures to and from
GMC owners and vendors. There is no attempt to replace or supersede recommendations from General Motors Corporation or any other
component manufacturer. This author does not guarantee or evaluate the accuracy of any information found on any of the Internet links listed in
the Idiot’s Internet Guide to Finding 1973-1978 GMC MotorHome Information. Any use made of such information is entirely at your own
risk. The author of this document is not responsible for any losses, damage or injury resulting from its use, or reliance on information provided.
Furthermore, the author of this document assumes no liability for implementation of the information provided to repair or alter vehicles. Vendors
listed are provided without recommendation.

GMC and the GMC logos, historically and contemporary, are trademarks of General Motors.

This document is produced through the collaborative efforts of Gary Bovee and Byron Songer. Gary did the research and seeks to make it as
accurate as possible. The Guide is, therefore, edited and changed on a quarterly basis. Byron is responsible for the general layout and the use of
some of his illustrations. The illustrations are copyrighted by Mr. Songer and used, herein, with his permission.

© Copyright 2014 - Gary Bovee

Revised July 2014

GMC MotorHome Information Page 4

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Contents

Chapter 1 ..................................................................... History of the GMC MotorHome 5

Chapter 2 Purchasing a GMC Motorhome

Buyers’ Checklist; Links and Tips for Searching
for a GMC Motorhome; Restoration Costs and

Restoration Project Links ................................................................................... 6

Chapter 3 Now that I Purchased a GMC Motorhome, What Next?

Manuals, Wiring Diagrams, Floor Plans,

..................................................................................................Paint Codes, etc. 7

Chapter 4 .......................................................Rebuilding the Olds 403 and 455 Engines 8

Chapter 5 .......................... GMC MotorHome Generator (Troubleshooting the Onan) 9

Chapter 6 .............................................. GMC Full Service, Parts and Repair Facilities 10

Chapter 7 .................................................................... GMC Suppliers and Publications 12

Chapter 8 Web Sites Full of GMC Information – Technical info,

................................................................photo archive, motorhome registry 19

Chapter 9 ............................. GMC Motorhome Clubs – GMC clubs around the USA 20

Chapter 10 GMCnet – Your Link to the GMC Community;

.............................................Take part in discussions and/or ask questions 22

Chapter 11 Black List - Roger Black’s indispensable list of folks

................................................willing to help in case of trouble on the road 23

Chapter 12 ................................................................................. Promoting the GMC TZE 24

Bonus ............................................................... Editorial Comment and DVD Label 25

Revised July 2014

GMC MotorHome Information Page 5

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Chapter 1

History of the GMC MotorHome

If you are interested in the history of the GMC MotorHome, below are some excellent links.

✦" Link to the GMC Heritage Center —

history.gmheritagecenter.com/wiki/index.php/The_GMC_MotorHome

An historical view of the GMC MotorHome at the GM Heritage Center, the official on­line resource of GM’s history. Written by Bill Bryant, well-know GMC history buff.

✦" The Story of a Classic —

www.bdub.net/publications/GMC_Motorhome_-_The_Story_of_a_Classic.pdf

Another great article by historian Bill Bryant; reprinted from a three-part series run in
Family Motor Coaching, the magazine of FMCA

✦" GMC MotorHome: Remembering the Classic —

www.fmca.com/join-family-motor-coach-association/stories/162-gmc-motorhome­remembering-a-classic

Todd Moning, a staff writer for Family Motor Coaching magazine, provides a look at the
GMC’s reputation for quality and originality, something owners take pride in.

✦" No Reservations Needed: The 1973 to 1978 GMC Motorhome –

www.automotivetraveler.com/magazine/viewer.php?path=vol_3/iss_2&page=23

Rich Truesdell, a writer for an online magazine geared toward the auto enthusiast,
provides his view of the fascinating aspects of the GMC MotorHome. (Note: This is the
second and updated printing of the article produced by the author updated with photo
from the GM archives).

✦" A Brief History of the GMC Motorhome —

www.gmcmotorhome.com/faq/what.html

✦" Telling the World about the GMC Motorhome — www.gmcers.org/

✦" Motorhome Brochures by GMC and Others —

www.bdub.net/publications/index.html

✦" Wikipedia: GMC MotorHome —

en.wikipedia.org/wiki/GMC_motorhome

✦" Web address for the TZE Interpreter —

www.gmcmotorhome.com/faq/vin.html

✦" The GMC MotorHome from Start to Finish –

www.bdub.net/billbryant/

Bill Bryant, GMC Historian, has assembled a great collection of CDs after many years of
effort obtaining the history of the GMC MotorHome. Over 500 images detail the history,
development, designs, prototypes, concepts, manufacturing, pricing, sales literature,
memorabilia, collectables, and much, much more.

Revised July 2014

#1 FAN

GMC MotorHome Information Page 6

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Chapter 2

Purchasing a GMC MotorHome

Buyers’ Checklist; Links and Tips for Searching for a GMC
MotorHome; Restoration Costs and Restoration Project Links

Following are some tips to look over before you rush out and purchase an over thirty-year-old
GMC motorhome.

✦" So You Want to Buy a GMC —

gmcmotorhome.info/buygmc.html

✦" Buyer’s Checklist —

gmcmotorhome.info/buyer.htm

✦" Links and Tips for Searching for Your Prospective GMC Motorhome —

www.bdub.net/publications/gmcsearch/index.html

✦" Cost to Restore a GMC —

gmcmotorhome.info/buygmc.html#cost

Note: It may be necessary to copy and paste the URL into your browser window.

✦" Restoring a Vintage RV Like the GMC —

http://www.gmceast.com/about/restore

This is a reprint of an article by Jim Bounds that first appeared in RV Adventure.

The illustration at left is a parody of
Grant Wood’s famous painting,
“American Gothic”. The painting
originally is of a farmer and his spinster
daughter standing in front of the family
house with a gothic-shaped window on
the second floor. The house is still
standing in Iowa. Mr. Wood used his
dentist and his sister for models. This
parody was used as a basis for GMCMI’s
30th anniversary convention held at
Amana Colonies in Iowa. For more
information about other parodies see

americangothicparodies.blogspot.com

Revised July 2014

GMC MotorHome Information Page 7

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Chapter 3

Now that I Purchased the GMC, What Next?

Manuals, Wiring Diagrams, Floor Plans, Paint Codes, etc.

This chapter is loaded with links to information that cover a very broad range from getting that
old sleeping giant started, things to check before hitting the road, spare tools to take along, re­pair manual and wiring diagrams, paint codes, specifications (capacities and dimensions & 455
Engine).

✦" Waking a Sleeping Giant — gmcmotorhome.info/buygmc.html#waking

Note: It may be necessary to copy and paste the URL into your browser.

✦" Pre-Travel Checklist and Other Documents — www.gmceast.com/lifestyle/

✦" Tools and Spares for the Trip — gmcmotorhome.info/SPARES.html

✦" Top Safety Maintenance/Upgrades Before You Hit the Road —

gmcmotorhome.info/safety.htm

✦" Repair Manuals — www.bdub.net/manuals/index.html

✦" Wiring Diagrams — www.bdub.net/wirediagrams/index.html

✦" GMC Dimensional Drawings — www.bdub.net/GMCdrawings/

✦" Weight Diagrams — www.bdub.net/GMCdrawings/GMC-Scale-Weights.gif

✦" GMC Floor Plans — www.gmcmotorhome.com/faq/models.html

✦" GMC, Coachman and Midas Interiors —

www.gmcmotorhome.com/faq/GMC23Interior.html

✦" GMC Paint Codes; 1973 thru 1977 —

www.gmcmotorhome.com/faq/GMCExterior1.html

✦" GMC Paint Codes; 1976 thru 1978 —

www.gmcmotorhome.com/faq/GMCExterior2.html

✦" Specifications (Dimensions, capacities & 455 Engine) —

www.gmcmotorhome.com/faq/specs.html

Revised July 2014

GMC MotorHome Information Page 8

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Chapter 4

Rebuilding the Olds 403 & 455 Engines

There is one person who stands outs more than any other when it came to an extensive
knowledge about Oldsmobile engines. That person was Joe Mondello.

Joe Mondello probably knew more about Oldsmobile engines than
anyone else on the planet when it came to making horsepower.
Mondello became knows as “Dr. Oldsmobile“ based on the
fictional character who wore a white jacket in the Oldsmobile
performance ads.

GM officials took note of his cylinder head savvy and was tapped
to design many of GM’s cylinder heads. His cylinder head designs
were used by the Who’s Who of racing’s greatest such as Carol
Shelby, Don “Big Daddy” Garlits, Don “The Snake” Prudhomme,
Tom “The Mongoose” McEwen as well as many others.

Mondello was also a GMC motorhome enthusiast later in life. He and has wife, Mary, were
Eastern States and Dixielanders members in addition to attending a couple of GMCMI
conventions. He had a wealth of knowledge about Oldsmobile engines and he enjoyed sharing
it with club members at rallies.

I recently came across an article written by Mondello titled “Rebuilding Your First Engine.” This
is a six part article with step-by-step instructions on how to rebuild Oldsmobile engines. It’s a
great article, full of information for those of you yearning to learn all you can about rebuilding
your Olds engine.

Get the article in PDF from this clickable link.

I also discovered, for you hardcore grease monkeys, Mondello Oldsmobile V8 Engine Technical
Reference Manual.

This manual is complete with casting numbers, factory
specifications, high performance blueprinting
specifications, drawings, charts, tables, photographs and
much more. The book is a must for any engine builder or
Oldsmobile enthusiast, whether their interest is in racing
or restoration. It contains 80 pages of little known facts
and tips for rebuilding Oldsmobile engines that will
make serious horsepower and stay alive, as well.
Complete Engine Building Tips contains step by step
detailed instructions for the person who wants to learn
by doing or for the experienced engine builder who
needs a quick reference guide. It covers every aspect of
Oldsmobile V8 engines from 1964 to 1990, except the

394.

It is available from MONDELLO Performance Products,
Inc. $26.00.

Go to www.mondellotwister.com/99cat.html

Revised July 2014

GMC MotorHome Information Page 9

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Chapter 5:

GMC MotorHome Generator
(Troubleshooting the Onan)

There are several informational links listed here to help keep
that Onan running smoothly. There are also a variety of
videos on You Tube dealing with gasoline-fired Onan’s
similar in size. They may be of assistance in some way.

✦ Numerous Onan Info Links from

Gene Fisher's Website —

http://gmcmotorhome.info/list.html#GEN

✦ " Onan Generator Trouble diagnosis by Onan —

!! !! !!!!!! http://www.youtube.com/watch?v=tJcwLyrHMq4&feature=gv&hl=en

✦ GMC Onan Power Drawer Electrical Trouble Shooting Demo - Duane Simmons -

“Mr. Onan” —
— General Information
— Pre-Trouble Shooting Activity
— Board to 12 Pin Connector (J2) Cable Wire Definition
— General Repair Comments
— Trouble Shooting Aid - No Power Output
— Trouble Shooting Aid - Will Not Respond to Stop Switch
— Trouble Shooting Aid - RC Panel is Non Functional
— Trouble Shooting Aid - No Starter Action
— Data Form - Trouble Shooting Aid

http://gmcws.org/Tech/dsimmons/onan_demo/

✦ Onan Preventive Maintenance Video - Duane Simmons "Mr. Onan" —

Duane was known as "Mr. Onan". His vast knowledge of the Onan made him the
expert! He is dearly missed.

http://gmcws.org/Tech/dsimmons/dsimmons.html

✦ Onan Manuals & Bulletins Etc. —

http://www.bdub.net/manuals/index.html

✦ Onan Control Board Operation - Circuit Board Schematic, General Repairs,

Trouble Shooting Aids and lots more information —

http://gmcws.org/Tech/dsimmons/onan/onan.html

✦ Onan Bridge Rectifier Replacement —

http://gmcmotorhome.info/generator.html#bridge

✦ Onan Pertronix Electronic Ignition Conversion —

http://gmcidiotsguide.com/joomla/gmc-products/product/27-bovee-s-electronic­ignition-kit/category_pathway-25

✦ Onan Overhaul Slideshow —

http://www.cathy-ron.com/GMC%20Generator.html

Revised July 2014

ALLOYSALLOYS

ALLOYS

GMC MotorHome Information Page 10

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Chapter 6

GMC Full Service, Parts and
Repair Facilities

This is a very lengthy listing of service & repair shops in North America. Included are names,
addresses, phone numbers, as well as web and email addresses if available.

– FULL SERVICE, PARTS AND REPAIR FACILITIES –

Alex Sirum GMC

1800 Hwy 70E
Okeechobee, FL 34972
863-763-1121

[e-mail]
www.gmcmh.com

Restoration, repair, and maintenance shop.
Hard to find parts.

Applied GMC

Jim Kanomata
47627 Kato Rd.
Fremont, CA 94538
510-440-1101 Orders 800-752-7502

[e-mail]
www.appliedgmc.com

Quadra-Bag 4 bag rear suspension, brake
reaction arm and rear disc brake upgrade,

3.55, 3.70, 4.11 final drives
Complete parts, service, and repair facility.

Cinnibar Engineering

116 Orval St
Sandusky, MI 48471
810-648-2444 Orders 800-720-2227

[e-mail]
www.thegmcmotorhomepeople.com

The official GMC parts supplier for GMC
Motorhomes. Total restoration, repair,
maintenance, and storage.

Cooperative Motor Works

Jim Bounds
5971 Anno Ave
Orlando, FL 32809
407-857-5777 Orders 877-275-4462

[e-mail]
www.gmccoop.com

Complete restoration service including me­chanical, exterior, and interior maintenance
and upgrades. Most GMC parts available. A
Cinnabar certified GMC repair shop.

Southland Motorhome Center

Zeb Frady, Zeb Jr. and Matt
4244 Sudderth Rd
Buford GA 30518
770-271-7502

www.southlandmotorhome.com

Service, repair and parts from donor coaches.
Replacement for OEM air bag.

Revised July 2014

1973-1978 GMC Motorhome Information Page 11

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– SERVICE & REPAIR ONLY –

Leon Atkins Motors

280 N Sunflower Drive
Holyoke, CO
970-854-4535
Complete GMC renovation services

Barry and Carolyn Owen

364 Dixon St
Lexington, NC 27292
336-956-3455

[e-mail]

Service, repair, and maintenance.

Best Way RV

4648 Northwest Grand Ave
Glendale (Phoenix), AZ 85301
623-934-5295

Service and repair.

Bob Stone

Carbondale, IL
618-964-9124
Service and repair.

Danny Dunn Transmissions

Memphis, TN
901-756-3860

[e-mail]

Transmissions for the GMC shipped
nationally.

DJs Classic GMC Motorhome Services

233 Northwest Olive
Sheridan, OR 97378
503-843-3247

[e-mail]
djsgmc.com

Cinnabar certified service and repair with lots
of extra but original parts available.

Gary Fravel

5505 East 450 N
Decatur, IN 46733
877-423-7027

[e-mail]

Repair and complete restorations.

Grandview Motorhome

Tom Hampton
13880 Weaver Rd
Marysville, OH 43040
937-644-4238

www.grandviewmotorhome.com

Restoration, service, and repair exclusively
for GMCs. SS brake and tranny lines.

Ken L. Frey Auto Repair

1669 N. Old Bethlehem Pike
Quakertown, PA 18951
215-536-1246

www.kenlfreyautorepair.com
[e-mail]

Service and repair of GMC Motorhomes.

MGM-GMC

(formerly Bob Lamey Enterprises)
Miguel Mendez
5436 E. Holt Blvd., Garage C-1
Montclair, CA
909-982-7747

[e-mail]
www.mgmgmc.com/

Full Service GMC Shop Re-curved
distributors and sensitized brake boosters.

New England RV Service

124 Plaistow Road
Plaistow, NH
603-382-8272
M - F 8am - 5pm.
Home - 603-382-8791

[e-mail]

Service and repair.

Topeka Body Shop

Larry Bontrager
Topeka, IN
219-593-2661

www.bdub.net/topeka.html

Complete body prep and paint
Please call to confirm availability of time and
space.

Revised July 2014

ALLOYS

ALLOYS ALLOYS

1973-1978 GMC Motorhome Information Page 12

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Chapter 7

GMC Suppliers and Publications

This is an extensive listing of parts suppliers that support the GMC MotorHome community as
well as a listing of publications that add to the body of knowledge within that community as
well as serving as an archive

– MASTER INDEX –

SUPPLIERS ........................................... 13

Adohen Supply 13
Ardemco 13
Albert Branscombe 13
Gary Bovee 13
Bill Bryant 13
Bob Burkitt 13
Classic Tube 13
John Clement 13
Correctrack 13
Bert and Faye Curtis 13
Custom Instrument Panels 14
Digi-Panel 14
DMAR Enterprises 14
John Evans 14
Steve Ferguson 14
Eugene Fisher 14
Gateway Motorhome Company 14
GEMRECS 14
Golby Motors 14
Guske Sales 14
Bob Hardeman 14
Leigh Harrison 15
Alan Henderson 15
Ken Henderson 15
Highland Machine Tool 15
Bob Hooten 15
Howell Engine Development 15
Jim Hupy 15
J & L RV Sunscreen 15
Frank Jenkins 15
Paul Keating 15
Gary Kosier 15
Paul Lambke 15
Dave Lenzi 15
Tom Lins 16

Jack McHaney 16
Blaine Merrell 16
Mondello Performance Products 16
Motorhome Enhancements 16
Len Novak & Eric Gibbons 16
The Peek Family 16
Ragusa Pattern Shop 16
Rance Fuel Injection Service 16
Steve Rasmussen 16
Gary Rockwell 16
Roll-Masters 16
Dave Simmons 16
JR Slaten 16
Bob Sobrito 17
Songer Consulting 17
Springfield Performance Ignition 17
Bob Sternfels 17
Bob Stone 17
The Streetrod Manufacturing Co 17
Terry Taylor’s GMC Nic-Naks 17
Manny Trovao 17
Variety Ventures 17
John R Wright 17

PUBLICATIONS ................................... 18

GMC Motorhomes International 18
GMC Motorhome News 18
GMC Eastern States 18
GMC Western States 18
GMC Motorhome Photo Archive 18

SOCIAL NETWORKING ..................... 18

Classic GMC Motorhome Group
on Facebook 18

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1973-1978 GMC Motorhome Information Page 13

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– SUPPLIERS –

Adohen Supply

Scott Nehoda
1270 Lear-Nagle Rd
Avon, OH 44011 937-5694

[e-mail]
rvvent.com

Fantastic fans, KYB shocks, e-brake pulleys.

Ardemco

714-722-7672 or 800-253-0115
Fax: [phone]

ardemco.com/ardemco.asp

Tanks and accessories.

Gary Bovee

12495 Muller ave.
Red Bluff, CA 96080
Alternator & A/C Belt Tensioner Adjustors,
Headlight & Turn Signal Alarms and
GMC Locking Valve Stem Caps

http://www.bdub.net/bovee/
BoveeProducts.pdf

Albert Branscombe

33 Rae Street, P.O. Box 44
Tiverton, ON, N0G 2T0 CANADA
519-368-7129

[e-mail]
www.bdub.net/branscombe/

Parking brake cable assemblies and power
actuators.

Bob Burkitt

11382 Marlette Dr
Cincinnati, OH 45249-2210
513-530-5021
Fax: [phone]

[e-mail]
www.bdub.net/bobburkitt

New screen door and Birch door replacement
parts.

Classic Tube

80 Rotech Dr
Lancaster, NY 14086
800-882-3711

www.classictube.com

SS brake lines cut and shaped with fittings ~
$300.

John Clement

1539 Yorba St
Corona, CA 92882
951-737-0969
Dana air compressor rebuilding or parts.

Correctrack

Gene Ransom
355 Copper Dr
Grants Pass, OR 97527
541-471-9042

[e-mail]

Front wheel spacers.

Bill Bryant

374 Overlook Rd.
Pleasant Valley, NY 12569
845-635-2812

[e-mail]
www.bdub.net/billbryant/

Historical documentation and showroom
presentations about the GMC MotorHome on
digital media.

Paul Burkhart

Pueblo, CO
719-542-0555

[e-mail]

Plexiglass shelving for the GMC Side Bath

Bert and Faye Curtis

5990 Greenwood Hts
Kneeland, CA 95549
707-443-8523

[e-mail]
www.bdub.net/curtis-unlimited

Steering column boot set, jack pad bracket, oil
coolers, body pad set, SS Electrolevel air tank
and manifold.

Revised July 2014

GMC MotorHome Information Page 14

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Custom Instrument Panels

“Mac” MacNeal
28585 Valley Dr.
Albemarle, NC 28001
704-985-0171

[e-mail]
www.custominstrumentpanels.com/
gmc.htm

Custom instrument panels and instruments.

Digi-Panel

Art Woodell
PO Box 178
Madera, CA
559-665-1546

[e-mail]
www.digi-panel.com

Systems monitor with emergency alarms

DMAR Enterprises

Jim DeMaere
2812 - 48th Avenue South
Lethbridge, Alberta T1K 7B3
403-329-3091
Stainless steel replacement air and water
heater tanks.

John Evans

486 Knox Rd.
East Aurora NY 14052
716-652-6868

[e-mail]

Carbon metallic rear brake kit that includes
all new hardware.

Steve Ferguson

4077 S. Wenro Drive
Sierra Vista, AZ 85636
619-212-5724

[e-mail]
www.bdub.net/ferguson/

Urethane bushings and ball joint boots

Eugene Fisher

Box 1702
Florence, OR 97439
925-784-3098

[e-mail]
www.gmcmotorhome.info

Alternator Protection Cable

Gateway Motorhome Company

4897 Schumacher Rd
High Ridge, MO 63049
636-677-2277 Orders 800-654-0374

[e-mail]
www.gmcmotorhomeparts.com

Large selection of GMC parts

Golby Motors

485 E Donegan Ave
Kissimmee, FL 34744
407-859-9000

www.golbymotorcorp.com

Original body parts. Repair, restore, and
manufacture parts.

Guske Sales

1303 23rd St
Port Huron, MI 48060
810-987-5788
586-530-9189 - Cell
Day/night shades custom fitted for your
GMC, outside window covers.

Bob Hardeman

[e-mail]

Bogie greasers

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GMC MotorHome Information Page 15

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Leigh Harrison

1520 Woodside Dr
Woodbridge, VA 22191
703-494-9914

[e-mail]
http://idencorpgmc.com

Six wheel disk brakes, 4 air bag suspension
system, serpentine belt kit, sensitized brake
booster.

Alan Henderson

4339 Hartley Bridge Rd. #117
Macon, GA 31216

[e-mail]
www.bdub.net/
GMC_Motorhome_Wiring_Diagrams.pdf

478-320-5974
Super-Sized GMC Motorhome Wiring
Diagrams

Ken Henderson

110 O’Hara Road
Americus, GA 31719
229-924-0851

[e-mail]
www.gmcwipersetc.com

Electric replacements for hydraulic wiper
motors.

Highland Machine Tool

3461 E. Luther Rd
Floyds Knobs, IN
812-923-8884
Fax [phone]

[e-mail]

Front wheel spacers to correct rut wander.

Bob Hooten

7538 Muller St
Downey CA 90241
562-928-4100

[e-mail]
www.bdub.net/hooton

“Trak Right” hardware for your bogies.

Howell Engine Development

6201 Industrial Way
Marine City MI 48039
810- 765-5100
Fax [phone]

www.howellefi.com

Throttle body fuel injection kit.

Jim Hupy

1754 82nd Ave. SE
Salem, Or 97317

[e-mail]
http://bdub.net/jhupy/

Pressure bleeder for brakes, GM Hub
extenders for ‘90s steel wheels

J & L RV Sunscreen

Jim and Linda Ball
Zephyrhills, Fl
Winter Phone [phone]
Cell 904-508-8253
Sunscreens for all windows

Frank Jenkins

18214
N.E. 21st St Gainesville FL 32609 352-485-1397

[e-mail]
http://sites.google.com/site/gmcfrank/

GMC fiberglass & aluminum fabrication.
Instrument panels, bumper covers, toolboxes,
grills, skirts and flares, radiator fan shrouds.

Paul Keating

860 Ridgebury Rd
New Hampton NY 10958
845-355-8701

[e-mail]

Hubs, knuckles, and other new and used
parts.

Gary Kosier

740-366-1833

[e-mail]
www.bdub.net/kosier/

Bogie Greaser Kit, Awning Protector

Paul Lambke

1241 Regional Rd 19, RR #1
Wilsonville, Ontario NOE 1ZO
519-443-7543

[e-mail] or

Dan Stuckey at [e-mail]

3.69:1 tranny chain drive sprocket kit.

Dave Lenzi

2285 Montague Rd
Davison MI 48423-9103
810-653-3902

[e-mail]

Steering components, leveler linkage, leveler
valve rebuilding, embossed copper exhaust
gasket.

Revised July 2014

GMC MotorHome Information Page 16

_________________________________________________________________________________________________________

Tom Lins

GMC Training Films on Digital Media
732-246-2867

www.bdub.net/tomlins/index.html

Jack McHaney

Medina TX
830-589-2431

[e-mail]

Thorley header kit includes gaskets, adapters,
bolts and a good set of instructions.

Blaine Merrell

101 Way West Airpark
Bainbridge IN 46105-9449
765-522-3241

[e-mail]
www.bdub.net/blainemerrell

Front window screens, wind wings, lower
radiator guard.

Mondello Performance Products

Paso Robles CA
805-237-8808

www.mondellotwister.com

High performance Oldsmobile engine parts.

Motorhome Enhancements

Jim Buchanan & Gene Dotson
730 10th St Dr NW
Conover NC 28613
828-465-0678 or 828-464-5105

[e-mail]

Modern replacement windows and
aluminum radiators.

Len Novak

[e-mail]

760-731-0751 &

Eric Gibbons

[e-mail]

530-447-5302
New Dash Lights and Labels for your
Instruments Panel

Ragusa Pattern Shop

1920 D East Warner Ave
Santa Ana, CA 92705
949-261-5898
Fax [phone]

[e-mail]
http://www.ragusarv.com

Cast aluminum entry step, trans pan, battery
tray, Onan starter bracket.

Rance Fuel Injection Service

Rance Baxter
230 Mountain View Rd
Genesee, PA 16923
814-228-3800

[e-mail]
www.rancefi.com

Port fuel injection.

Steve Rasmussen

Northfield, MN 55057
507-663-7266

[e-mail]

General service and repair.

Gary Rockwell

937-367-3744!!!!!!
rockwellprecision @ att.net

Creator of the one and only, direct
replacement, low-profile Aluminum Intake
Manifold for our GMCs.

Roll-Masters

John Eichler
888-883-5866

[e-mail]
www.angelfire.com/fl5/tirecovers/

SS and fiberglass spare tire covers.

Dave Simmons

705-327-0417
Rear overhead cabinet, several finishes,
provide that little extra storage the GMC
desperately needs; in Michigan.

The Peek Family

3711 Enterprise Road
Mitchellville, Maryland 20721-2102

[e-mail]
www.bdub.net/updater/

Tail Light Updater Kit

JR Slaten

7702 Old Third Street Rd
Louisville KY 40214
502-363-3011

[e-mail]
www.bdub.net/jrslaten.html

Beautifully rebuilt PowerLevel air valves and
new, stainless steel oil cooler lines.

Revised July 2014

Second Generation Logo for GMC

used only in the mid 1970’s

GMC MotorHome Information Page 17

_________________________________________________________________________________________________________

Bob Sobrito

9927 Lemon Ave.
La Mesa, CA 91941
619-460-2145

[e-mail]

Battery Saver to save your house battery from
running down.

Songer Consulting

Byron Songer
9821 Meadow Vale Drive
Louisville KY 40242
502-254-3371

[e-mail]
www.songerconsulting.net

Graphic illustrations owners can use for
creating paint schemes and computer/
iPhone/iPad application for tracking fuel
economy, repair and maintenance events and
members of the Black list.

Springfield Performance Ignition

Dick Paterson
R.R.#3
Coldwater, Ontario, Canada LOK 1EO
705-325-4554
Fax [phone]

[e-mail]
www.paterson-gmc.com/

Re-curved distributors. Rebuilt carburetors,
engines, transmissions. Wire sets, HEI
conversion.

Bob Sternfels

395 Pine Crest Dr.
Laguna Beach, CA 92651
949-497-3534

rwsternfels @ cox.net

Air Bag Protector Sleeves

Bob Stone

8159 Day Rd
Carbondale, IL. 92651
618-964-9124
Repair, purchase remaining stock of
GEMRECS, a former GMC salvage operation
in Houston, TX

The Streetrod Manufacturing Co

4321 E Willow Creek Road #16
Castle Rock, CO 80104
303-688-6882

[e-mail]
tsmmfg.com/GM_Motorhome_others.htm

Rear disk brake kit.

Terry Taylor’s GMC Nic-Naks

www.dldesignstore.com/

GMC club name tags, drink coasters,
replacement decals for most models, club
license plate frames, etc.,

Manny Trovao

11447 Trenton
San Jose, CA 95127
408-937-1583
Cell 408-605-2079

[e-mail]
http://www.mannystransmission.biz

Rebuilding TH-425 transmissions and
installing Switch Pitch, built specifically for
our motorhomes. 3.50:1 Power Drive chain &
sprockets, 1-ton Front End, Brake Reaction
System

Variety Ventures

Dan Stuckey
Box 105 3249 Inwood Rd.
Inwood, Ontario Canada N0N 1K0
519-844-2083

[e-mail]

New main frame components (side rails, cross
members, H-frames) DIY or installed, Ramco
mirrors, Fan-Tastic vents, macerator kits,
stain- less steel Onan mufflers.

John R Wright

[e-mail]

Front Air Dam, Bolt kits for bumpers, axles,
exhaust manifolds, header.

Revised July 2014

GMC MotorHome Information Page 18

_________________________________________________________________________________________________________

PUBLICATIONS

GMC Motorhomes International

Billy Massey, Administrative Officer
7110 Forbess Dr.
Brownwood, TX 76801
325-784-5861
325-665-4357

[e-mail]
www.gmcmi.com

Quarterly technical publication for club members.

GMC Motorhome News

116 Orval St
Sandusky MI 48471

810-648-2444
www.thegmcmotorhomepeople.com/news/

Quarterly publication from Cinnabar with
excellent technical articles.

GMC Eastern States

Byron Songer, News and Web Editor
9821 Meadow Vale Dr.
Louisville, KY 40243
502-254-3371

[e-mail]
www.gmceast.com

Quarterly publication for members who also
have access to technical articles via the web.

GMC Western States

Armand Minnie, Pres.
13533 N Buckhorn Cholla Dr.
Marana, AZ 85658-4159
520-744-1775

[e-mail]
www.gmcws.org

Quarterly technical publication for members.

GMC Motorhome Photo Archive

Billy Massey

www.gmcmhphotos.com/

User-submitted GMC Motorhome photo
storage and display. Some users provide
excellent photos and commentary on
work projects.

GMC Group on Facebook

http://www.facebook.com/groups/
classicgmcmotorhomes/

A social group on Facebook classic GMC
motorhome fans. Members of the group may post
photos and comments. Note, however, that this is
not a technical group for Facebook.

SOCIAL NETWORKING

Revised July 2014

1973-1978 GMC Motorhome Information Page 19

_________________________________________________________________________________________________________

Chapter 8

Web Sites Full of GMC Information

This chapter lists some of the better sites that provide a great variety of information. On these
web sites you’ll get help with maintaining, repairing or upgrading your GMC.

Gene Fisher’s GMC Technical Information Page

This site has tons of information on how to repair and upgrade your GMC. MR.ERF, as he’s known,
gleans the GMCnet gathering great ideas from other, knowledgable owners then archives it here ac­cording to subject.

gmcmotorhome.info/

GMC Photo Archive homepage

The site is divided into the following categories – Member galleries (Modification, Electrical,
Mechanical, Interior, Exterior) Upgrades, & Showing Off.

www.gmcmhphotos.com/

The search page, somewhat hidden on the site, may be accessed here.

http://www.gmcmhphotos.com/photos/search.php

Bdub’s Place

FAQs assembled by Billy Massey and presented here. Billy also has a collection of information from
brochures of the era.

www.bdub.net/gmc-faq.html

A great collection of old GMC Brochures and Manuals

www.bdub.net/publications/index.html

Some Great GMC motorhome links

www.bdub.net/GMCLinks.html

Jim Bounds’ Cooperative Motor Works

The more popular element of this site is the Daily Pose. Jim blogs about a variety of things related to
the GMC and the work he and others do refurbishing classic GMCs and other RVs of interest. This
site also has a little bit of everything – how to information, coaches for sale, etc. Become a member
and get access to all kinds of additional support.

www.gmccoop.com/

GMC Motorhome Registry

The GMC Registry was founded by Dave Greenberg. In May of 2011 responsibility for operation was
handed over to John Shotwell. The goal is to locate, develop and maintain a historical record and
track changes in ownership for the 12,921 GMC Motorhomes built between 1973 and 1978. Dave has
done a fantastic job of tracking this info. An online registration page exists for new owners to register
their TZE-based coach.

www.gmcmhregistry.com/

Promote Your GMC

In recent years many owners have wanted resources to help in promoting their GMCs whether
parked at a KOA or at an automotive show. The Eastern States website has an area with templates
that can be used in proudly promoting your classic coach. There’s a table or windshield poster, tri­fold brochure and a GMCers business card.

www.gmceast.com/gmcers/

Revised July 2014

GMC MotorHome Information Page 20

_________________________________________________________________________________________________________

Chapter 9

GMC Motorhome Clubs

Below is a list of links to GMC motorhome clubs across the US and Canada. Also, a number of
these sites have technical information available on their web site for anyone to view. Go check
them out. Some clubs do not host websites but are still listed below.

GMC Cascaders

www.fmcanw.org/gmc

Oregon, Washington, Idaho, British Columbia and Alberta (Canada)

GMC Classics Motorhome Club

www.gmcclassics.com

Oklahoma, Arkansas, Louisiana, and Texas

GMC Colonial Travelers

www.gmccolonial.com

Its membership is drawn from a 200 mile radius of Morris County, New Jersey.

GMC Dixielanders

www.gmcdixielanders.org

Alabama, Georgia, Kentucky, Mississippi, Tennessee, and the Western Carolinas.

GMC Eastern States

www.gmceast.com

The Mississippi river and east in the United States and Canada. The chapter purpose is to promote
the preservation of the GMC motorhome through technical presentations at rallies.

GMC Elegant Cruisers

Members live in Southern California & Southern Nevada.

GMC Flatlanders

Kansas, Missouri, Oklahoma, Arkansas, Nebraska, Iowa & Colorado

GMC Gateway Motor Cruisers -

Saint Louis and 200 mile radius

GMC49ers

https://sites.google.com/site/gmc49ersclub/home

Northern California & Northwestern Nevada

GMC Great Lakers

www.gmcgreatlakers.org

All state and provinces of Canada that touch the Great Lakes

GMC Greater Midwest Classics

www.gmcmidwestclassics.org

Iowa, Minnesota, Nebraska, North Dakota, South Dakota, Wisconsin, Manitoba and Ontario

Great Mountain Classics

Its membership includes members living in Utah

Revised July 2014

GMC MotorHome Information Page 21

_________________________________________________________________________________________________________

GMC Heritage Cruisers

www.gmcheritagecruisers.com/

Its members are drawn from 200 mile radius of Niagara Falls.

GMC Motorhomes International

www.gmcmi.com

GMC MI was formed to provide the exchange of technical and non-technical information on the
GMC MotorHome in a quarterly newsletter and at semi-annual conventions.

GMC Mountainaires

Members generally live with a 500-mile radius of Denver, Colorado.

GMC Nor’easters

Its members are from the northeastern portion of the United States and neighboring Canadian
provinces.

GMC Pacific Cruisers

www.gmcpc.org

Members primarily reside in Southern California (Los Angeles to San Ysidro).

GMC Sagurao Jetset

www.gmcsj.com

Members are from Arizona

GMC Six Wheelers

Its membership is drawn from Chicago and a 200-mile radius of the Windy City.

GMC Sunshine Statesmen

www.gmcss.com

Primarily for residents of Florida whether full- or part-time; monthly rallies through the winter
season.

GMC Tidewater Crabs

Delaware, Maryland, New Jersey, Pennsylvania, Virginia & District of Columbia.

GMC Western States

www.gmcws.org

Mainly drawn from the 11 western states and 3 western provinces of Canada. The chapter purpose is
to promote the preservation of the GMC motorhome through technical presentations at rallies.

GMC Yankee Clippers

Its membership is drawn from the New England States.

Family Motor Coach Association (FMCA)

www.fmca.com

To become a member of a GMC club you must first be a member of FMCA.

Revised July 2014

GMC MotorHome Information Page 22

_________________________________________________________________________________________________________

Chapter 10

GMCnet – Your Link to the GMC Community

I don’t think enough can be said about the GMCnet and what it means to the GMC community.
If you need information on how to repair your GMC, where to find a part, etc., there will be
community member happy to help you find the information you’re looking for.

GMCnet exists for the purpose of exchanging information and promoting discussion about the
motorhomes manufactured by General Motors Corporation (GMC) from 1973 to 1978.
Discussion about all aspects of the GMC MotorHome and the mutual interests of their owners
is encouraged.

GMCnet is an open subscription list. No qualification is required to join, nor is ownership of a
GMC motorhome a prerequisite. The only requirement is a genuine interest in the GMC
MotorHome or TransMode.

As an internet discussion group, users may interact with other members of the GMCnet by way
of email subscription or through the what is called The Forum (a mirror of the mailing list). At
the Forum web site owners may also participate in the Swap Meet or through out comments in
the Sandbox.

Join: www.gmcnet.org/signup.htm#RULE1

GMCnet Home: www.gmcnet.org

GMCnet Forum, Swap Meet and Sandbox: gmc.mybirdfeeder.net/GMCforum/

GMC “truck” pulling a GMC “trailer” – a PhotoShop reworking

by Wayne Shearer of an original image by Byron Songer

Revised July 2014

GMC MotorHome Information Page 23

Sterling Mist

_________________________________________________________________________________________________________

Chapter 11

Black List

GMC Motorhome Assistance Listing (aka The Black List)

“Any time of the day or night if you’re in your GMC”

You can download a current copy here - www.bdub.net/Black_List/GMCAssist.pdf

Copies are available in PDF or Excel format. I suggest you download and printout a copy to
carry in your motorhome or you can keep it stored on your laptop or memory stick that you
carry in your GMC.

To be included on the list or to update your information go to - www.bdub.net/Black_List/

In addition to the two, hardcopy formats of the Assistance Listing, there’s a visual version at
BatchGEO. It uses a Google Map to display locations of contacts on the list. Go to

http://www.batchgeo.com/map/c08045cc78af2cf8890e90a57d497a63 for the map. It’s an easy

way of locating who may be near you or your path as your travel.

An interesting anecdote about the list is that Roger Black, for whom the list is nicknamed, began
building the list before he was a GMC owner. He was aware of this type of list for Triumph
owners and thought the concept would be great for GMCers. After buying a Birchaven and
taking delivery, it broke down on his journey back to his home state. At that point the Black List
even came in handy for Mr. Black.

The list has been a “life-saver” for many owners who never leave home without a copy in their
coach or on their laptop. Heed the advice, keep a copy with you at all times. It will help you
save time and frustration while giving your comfort knowing help is just a phone call away.

Revised July 2014

GMC MotorHome Information Page 24

_________________________________________________________________________________________________________

Chapter 12

Promoting the GMC TZE

As GMC owners, we are all interested keeping these great machines alive and on the road for
many more years to come. Byron and I believe it is in every GMC owner’s best interest to be
ready to promote these coaches when the opportunity arises. To that end we are providing a
business card template available for download that shows the web address to the Internet Idiots
Guide for GMC MotorHome Information.

The business card can be given out that shows an Internet link to www.gmcidiotsguide.com.
This is an easy way to introduce prospective buyers to a concise reference Guide to all types of
GMC info (history, purchasing, parts and services, clubs etc.) It is small enough that you can
carry a few with you in your pocket to give out when the opportunity arises. Or, if you prefer,
print this information on the back of your card.

Guide Business Card

Download the card (to be used as the back side of your card) in PDF format here! The
document is designed for the Avery 5371 sheet and is compatible with any sheet for five-down
and two-across printing. After clicking on the link a new window will open in your browser
and the file (IdiotsGuidePromoBusCard.pdf) will be downloaded to your default download
location. The file can be opened in application that reads the .pdf file structure.

Revised July 2014

Illustration by Byron Songer

November 2012

GMC MotorHome Information Page 25

_________________________________________________________________________________________________________

Bonus Material

Editorial Comment on “GMC MotorHome”

For this document, Gary and I have elected to use the designation originally used by GMC for
their revolutionary product, the GMC MotorHome. By restoring this term we hope to rekindle
awareness that the TZE-based chassis and body developed by GM was truly unique and worthy
of a name that set it apart, though subtly, from other names.

In the early 1970’s the term “motorhome” was somewhat new. Originally these vehicles were
called “house cars.” FMCA used the term “motor coach” because the earlier vehicles were just
that’ repurposed, over-the-road coaches or buses. Out of respect for other material in existence
that refers to the product as “GMC Motorhome” we have retained that term which refers to any
configuration of GMC chassis and body regardless as to whether it was finished by GMC or
other upfitters such as Coachmen. TransModes that have been converted to contain living space
would fall under this designation as would the Navion conversions and others. We prefer to use
the historically accurate product term when referring to the GMC MotorHome as built and
finished by GMC, the Truck and Coach division of GM.

The illustration is a vector recreation of a clay model that was developed

based on drawings done at the design center for GMC. This particular

model was not in full size and it also included some “forward thinking”

ideas that presented a challenge to manufacturing at that time.

The original model was based on a 23-ft coach. This, of course,

is based on a 26-foot model.

Revised July 2014

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GMC MotorHome Information Page 26

_________________________________________________________________________________________________________

CD/DVD Label

Use the following graphic to print a CD label for this guide. The CD can be used to give to a
friend or prospective owner. You may access the label at the URL provided below. Note that the
graphic is available as a 150 dpi image. It can be reduced using your preferred labeling program
and will print at high quality using an inkjet printer.

http://www.gmceast.com/about/Idiots-Guide-CD-Label.png

Revised July 2014