MACK CHU, CXU, GU, TD, MRU Instruction Manual

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BODY BUILDER INSTRUCTIONS

Mack Trucks

Electrical Wiring and Connections

CHU, CXU, GU, TD, MRU, LR

Introduction

This information provides design and function, specification and procedure details for Electrical Wiring and Connections for MACK vehicles.

Note: For information on mDrive PTO installation and wiring see Section 9 PTO Installation, mDrive.

Note: For information on PTO parameter programming see Section 9 PTO Parameter Programming.

Unless stated otherwise, following a recommendation listed in this manual does not automatically guarantee compliance with applicable government regulations. Compliance with applicable government regulations is your responsibility as the party making the additions/modifications.

Please be advised that the MACK Trucks, Inc. vehicle warranty does not apply to any MACK vehicle that has been modified in any way, which in MACK's judgment might affect the vehicles stability or reliability.

Section 3

Contents

• “Abbreviations”, page 3

• “General Wiring Definitions”, page 4

• “Routing and Clipping Guidelines”, page 5

• “Body Builder Connectors, Schematic Examples”, page 17

• “Remote Start n Stop”, page 23

• “Remote Engine Stop”, page 24

• “Adding Auxiliary Accelerator Pedal”, page 25

• “BodyLink III”, page 26

• “Auxiliary Switch Locations (Cab)”, page 30

• “Power Connections”, page 31

• “Control Link II”, page 37

• “LR Workbrake”, page 50

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• “Wiring J1939”, page 52

• “9-pin Diagnostic Connector”, page 54

• “16-pin Diagnostic Connector”, page 55

• “Termination Resistor”, page 60

• “Parameter List”, page 61

• “Multiplexing Body Builder J1939 CAN ”, page 77

• “Support Inbound and Outbound J-1939 Message Information ”, page 85

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Abbreviations

• ACC Adaptive Cruise Control

• BOC Back of Cab

• CAN Controller Area Network

• CDS Custom Defined Statement (replaced by DCL)

• DCL DataMax Control Language

• ECM Engine Control Module

• EHT Electronic Hand Throttle

• EMS Engine Management System

• ESC Engine Speed Control

• FMI Failure Mode Identification

• GMT Greenwich Mean Time

• MID Message Identifier (J1587 source)

• PGN Parameter Group Number (J1939 message ID)

• PID Parameter Identification (J1587)

• PID Product Identification (order code)

• PTO Power Take Off

• PTT2 Premium Tech Tool 2

• SA Source Address (J1939 unit identifier)

• SID Subsystem Identification (J1587)

• SPN Suspect Parameter Number (J1939 parameter)

• SSC Single Speed Control

• TCM Transmission Control Module

• VDA Vehicle Data Administration (OEM database)

• VECU Vehicle Electronic Control Unit

• V-MAC Vehicle Management And Control (Mack brand electronics name)

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General Wiring Definitions

The general wiring definitions provides a standardized list of terminology used in running wires, hoses, and cables throughout the vehicle.

Abrasive Surface

AWG

Bundled With

Cable Tie

Chafing To wear away by rubbing

Contacts

Crimped A routed commodity that is bent or pressed into ridges

Damaged An item that differs from its original condition

Drooping Routed items hanging downward which are detrimental to safe vehicle operation

Dual Fall

High Current

Electrical Cables

High Nut Extended clamp length

Kinked

Items capable of causing damage to the routed commodity in a rubbing condition during vehicle

operation

American Wire Gauge

A number of items tied, wrapped, or otherwise held together

A nylon plastic self-sizing strap, UV resistant, capable of bundling specified load(s) during vehicle

operation

Items touching each other.

(Pertaining to the Compressor Discharge Line) A high point in the routing of the Compressor Dis-

charge Line (located on the engine) whereby any collected moisture is allowed to fall in two different di-

rections where it is either dissipated by heat or is purged

Wire sizes 13 mm sq. (0.5 inches sq.) (6 AWG) and larger

A tight bend, curl, or twist in the routed commodity causing flow to be restricted

Low Current Elec-

trical Cables

Low Nut

Material Grade 30

Material Grade 50

May

Not Secured

Plastic Conduit

Puncture Small hole or wound

Routed With

Rubbing Items that contact each other and have independent movement

Shall

Sharp Edge A surface capable of cutting or piercing the routed commodity during vehicle operation

Should

Verb typically used in a statement of practice that is a permissive condition and carries no requirement

or recommendation. It can be included to alter statements of mandate or recommendation

Corrugated or smooth wall tubing used to protect hoses, harnesses, cables, tubing, pipes, etc.

Items taking the same path but not attached to each other (i.e., parallel but separate)

Verb typically used in a statement of required, mandatory or specifically prohibitive practice regarding

Verb typically used in a statement of recommended, but not mandatory, practice in typical situations

with deviations allowed if Engineering judgement or Engineering study indicates the deviation is

Wire sizes 8 mm sq. (0.3 inches sq) (8 AWG) and smaller

Standard clamp length

Minimum yield strength of 30,000 psi

Minimum yield strength of 50,000 psi

Items not fastened, bundled or tied

routing and clipping

appropriate

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Twisted

Distorted from the routed commodities’ original shape about it’s cross-sectional center line

Touch Items that contact each other but do not have relative movement

Routing and Clipping Guidelines

1 Brackets used in routing and clipping should be Material Grade 50 or better to ensure sufficient clamp load when sharing

joint connections with cross members or other structural members. This applies only to joint connections using a low nut. Brackets of Material Grade 30 are acceptable provided the shared joint is using a high nut. The area of the clip bracket under the bolt head must be a least as large as the bolt head itself.

2 Clips that scratch exterior mounting surfaces shall not be used (i.e., barbed/spring type) unless the material is non-corrod-

ing (i.e., plastic). Clips must have rust protection.

3 Clip sizes should adequately secure the bundle without restricting flow, causing collapse, or preventing relative

movement.

4 Bundles shall be supported at 24 inches (600 mm) maximum intervals, a cable tie should be used between clip points on

bundles with the exception of electrical wiring harness which shall have a maximum support distance of 18 inches (450 mm) and a cable tie on bundles between clip points. When air and electrical lines are bundled together, the commodity with the greater cross sectional area may determine the support spacing. A minimum of two cable ties shall be used between clip points to bundle electrical lines when the larger interval is used.

W3104131

1 Support electrical cables every 18 inches (450 mm)

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Support Distances, Continued

1 Support cables near connectors every 4 inches (100 mm)

W3104144

1 Electrical cables and wiring harnesses are to be secured 4 inches (100 mm) from the wire insertion end of the connector

or clipped to the body.

2 Routing and clipping on purchased components (i.e., engine/transmission) should not include removing or replacing a

bolt(s), nut(s) or screw(s) installed by the manufacturer. In such cases where this is unavoidable, the bolt(s), nut(s) or screw(s) shall be re-installed to the manufacturer’s specifications.

3 Bundles should not contact sharp edges of cross members. Contact may occur if it is against a smooth surface, a smooth

radiused edge or a coined edge and the bundle is secured to prevent independent movement.

4 Hoses, tubing, pipes and electrical conduits shall not rub each other but may touch.

5 The fabric braided portion of the compressor discharge hose is compatible to be bundled with all routed air lines.

6 The compressor discharge pipe shall be routed independent of all other routing.

7 Electric cables/harnesses must not be bundled with fuel or hydraulic lines. The electrical cables/harnesses may be routed

parallel with fuel or hydraulic lines, however must remain separated by approved clipping materials. When design control is possible, electrical cables/harnesses will be routed above fuel or hydraulic lines. If fuel or hydraulic lines must route above circuit protected electrical cables /harnesses, the fuel or hydraulic lines will have no fittings or potential leak points above electrical cables/harnesses and shall be minimized to the shortest distance possible over low current electrical cables/harnesses.

8 All associated markings on air and electrical harnesses should have a corresponding clipping apparatus.

9 Critical clipping locations shall be designated on the component to insure proper placement in the vehicle (i.e., tape).

10 Maximum support distance for compressor discharge rigid pipe, 30 inches (762 mm). Pipe to be isolated from support

brackets (i.e. rubber isolator).

11 Maximum support distance for compressor discharge flex hose, 24 inches (600 mm).

12 Compressor discharge line should have a constant fall from compressor to air dryer. A dual fall is allowable provided it oc-

curs on the engine and within 24 inches (600 mm) of the compressor.

13 Maximum allowable dip in compressor discharge pipe/hose is one half the outer diameter of the pipe/hose. Preferred rout-

ing should have no dips in any of the routing. This is to avoid line blockage due to water collecting and freezing in the line.

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Heating Specifications

In order to maintain the integrity of the cables and hoses, observe the following specifications for routing near a heat source.

Cable, hose, or harness

type

Electrical cables and wiring

harnesses

Unprotected hoses, tubing,

harnesses, and cables

5 inches (130 mm) in all directions from turbocharger, exhaust components, and other high

6 inches (150 mm) above, 5 inches (130 mm) beside and 4 inches (100 mm) below

Specification

heat components

Hoses, tubing, harnesses,

and cables protected by re-

3 inches (76 mm) above, 2 ½ inches (63,5 mm) beside and 2 inches (51 mm) below

flective heat sheathing

Silicone transmission coolant

hoses

2 inches (51 mm) from exhaust manifold and turbo (with reflective heat sleeving), 1 inch (25

mm) from exhaust pipe

Hoses, tubing, harnesses,

and cables protected by a

heat shield (no reflective

3/8 inch (10 mm) between the component and the heat shield. (Not valid for fuel lines)

sheathing)

Refrigerant suction hoses 8 inches (200 mm)

W3109897

1 Heat Radius from the Turbocharger, Front: 5 inches (130 mm)

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W2106268

The SCR, DPF, and exhaust piping generate substantial heat. Keep electrical cables away from these components.

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Clipping Guidelines

Clipping brackets should be designed and mounted to adequately support the bundle. Clips should be mounted in a hanging position or supported along three-quarters of the horizontal mounting surface. Orientations that do not conform to the illustrations shall be tested.

1 When hoses, wires, and cables cross one another, secure them with a clamp. This prevents the sawing motion that could

abrade them.

2 When routing flex hoses that are bent in two planes, clip them to prevent twisting. Clamp the hose at the point where the

hose changes planes. The clamp has the effect of dividing the hose into two assemblies. If the section of the hose is bent in the same plane as the movement, the bend will absorb the movement and the hose will not twist.

W3103550

W3103553

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When routing connectors with cable ties, ensure the cable ties do not contact the connector locking tab. Cable ties should also not contact the bare wire.

W3104148

W3104149

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Battery Cable Guidelines

The battery cable guidelines prevent electrical interference that can occur from improperly routed cables. In addition, the guidelines prevent cable damage through abrasion.

1 Battery cables with standard SAE stranding shall be supported at 16 inches (400 mm) maximum intervals. A separator

type cable tie or an independent separator with cable tie may be used between clip points. No relative movement may occur between cables. If two (2) cable separators are used, they are to be installed equidistant from each other and arranged on a straight line, a maximum span between clip points of 24 inches (600 mm) may be used.

2 Strain relief clipping shall be provided for the battery and starter motor terminals. The strain relief clip shall be located with

no relative motion to the terminals. The strain relief clip should be located close to these terminals and shall be within 20 inch (500 mm) cable length to the starter terminals.

3 Grommets shall be installed at points where cables pass through sheet metal or frames.

4 Routing shall avoid exposed edges of frame members, abrasive surfaces, and all sharp edges. When routing inside the

frame, ensure that no contact with the frame is made with uncovered cables. Uncovered battery cables, external of the battery box, shall be routed independent of all other conduits. Covered cables may be bundled with other similarly covered conduits and air piping with a secured separator. Do not route with/under fuel lines.

5 Cables should be clipped as close as possible to all cable bends.

6 Battery cables shall not be located within 5 inches (130 mm) of engine exhaust related components or other heat sources

without heat coverings or heat shielding. Testing shall be performed to determine effects of closer allowances and the use of heat shields. Battery cables should not be installed in any area directly above engine exhaust related components.

7 Where cables flex between moving parts, the last supporting clip shall be securely mounted such that relative movement

does not promote chaffing.

8 Battery cables shall not support any mechanical loads other than their own mass.

9 Minimum bend radii of battery cables should be 3 times the cable diameter for standard SAE strand cable.

W3104133

1 Tube Diameter

2 Circle Diameter ( 3 x Tube Diameter)

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Battery Guidelines, Continued

1 Star washers shall not be used on current path connections including grounds.

2 Asphalt type loom shall not be used for battery cable protection applications.

3 Battery cables shall not rub each other or surrounding items, but may touch when all items have no independent move-

ment. Uncovered battery cables may not touch each other outside the battery box.

4 All exposed exterior to cab circuit ends shall be coated with a dielectric protective coating. Thickness to be 0.13 – 0.3 in-

ches (3.5 – 7 mm) wet, full coverage, 3 inches (76.2 mm) diameter, or shall be completely covered with required inhibitor.

5 Clip orientations should be per illustration or installation drawings utilizing compression or heavy duty clip.

6 Plastic conduit may be bundled and cable tied with covered battery cables when all items have no independent movement

with each other. Battery cables may touch each other, plastic conduit or the battery, inside the battery box.

7 Covered battery cables may be securely tied or clamped to each other if no independent movement exists. Cables at-

tached to the same terminal stud may be tied or clamped to each other.

8 Battery cable ends at the starter motor posts should be installed and positioned first with the engine harness terminals as-

sembled after. Starter terminals that come with the starter may be first on the starter studs. Terminals shall not be re-configured or bent.

9 Frame bolt placement, adjacent to the battery box, should have the bolt or screw threaded end facing away from the bat-

tery box and any related cables. Wrench grip type bolts should not be used in the frame at the battery box area. Nonwrench grip type bolt or screw threaded ends may face toward the battery box only if clip bracketing or shielding shall be provided to prevent any possible cable contact with frame mounted hardware. Bolts that mount the battery box to the frame may be oriented toward the battery box.

10 Added abrasion protection should be used where the cable contacts other routed commodities or surfaces with no inde-

pendent movement such as frame rail surfaces or transmission and engine castings. Polyethylene, polypropylene, nylon conduit and thick wall heat shrink tubing may be used for added abrasion protection.

11 Cables should be located to afford protection from road splash, stones, abrasion, grease, oil and fuel. Cables exposed to

such conditions should be further protected by either, or a combination of, the use of heavy wall thermoplastic insulated cable, additional tape application, plastic sleeve or conduit.

12 Anytime an existing fastener is used to secure a clipping bracket (or any similar device), the fastener shall be re-torqued

to the value specified in the original documentation given for the fastener.

13 Each exposed exterior circuit end must be coated with a dielectric protective coating. Thickness to be 0.13 – 0.3 inches

(3.5 – 7 mm) wet, full coverage, 3 inches (76.2 mm) diameter.

14 Do not use box clamps to secure battery cables.

15 In addition to berringer clamps, use double-head tie clamps.

W3077595

Berringer clamps are recommended for securing battery cables to each other.

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W3105372

Box Clamps (shown above) are NOT to be used for securing battery cables to each other.

W3105374

Double-head tie clamps may be used to route battery cables.

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Ring Terminal Assembly

Assemble terminal carrying the highest current (largest gauge wire) first, then graduate to the smallest gauge up to the fastener. Use a maximum of three (3) terminals per stud (unless otherwise specified on an illustration drawing).

W3104152

When attaching ring terminals with a fastener, tighten the fastener to appropriate torque so that the contact area will touch the terminal at any point, in a full circle that is part of the terminal.

W3104153

1 Contact Area

2 Fastener

3 Stud

4 Terminals

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When attaching multiple terminals, position the terminals at an angle to allow maximum contact of the terminal surface. Terminals are not allowed to bend other than their natural form. Terminals may be stacked back to back.

W3104154

Improperly fanned terminals result in unacceptable bends.

W3104155

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NOx Sensor Routing

The NOx sensor requires unique routing considerations. The NOx sensor harness must not be bundled with other wiring harnesses. However, it may be routed with other harnesses as long as they are not high voltage cables. The sensor harness is a set length and no altering or modifying of the NOx sensor harness is allowed.

W3104156

Conventional

W3109892

Cabover

Note: DO NOT splice into a V-MAC, ABS/ATC or any other electronic control unit harness.

Do not cut or tap into the J1939 green/yellow twisted wires or any other wire or harness used on this vehicle. Use the provided connectors, and only add approved J1939 components with validated software. Failure to comply may result in personal injury or equipment damage. Any cutting, splicing, alteration or modification to the wiring will Void the Mack Trucks Warranty on the Electrical System.

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Body Builder Connectors, Schematic Examples

Third party devices are often installed on MACK trucks. These devices need information (vehicle speed, gear, etc.) to operate safely and efficiently. However these devices are not quality controlled as far as MACK is concerned, and are not part of the main control databus. Therefore, MACK provides an external connector to supply a body device with the necessary information it needs to function properly.

MACK trucks do not use an external body builder module (BBM). In MACK trucks, the functions of the BBM are managed by the Vehicle Electrical Control Unit (VECU) and are transmitted to the body device via an SAE J1939 connector. SAE J1939 is a communications link between standalone vehicle modules. This data link is commonly referred to as the “Control Data link”. It is used primarily to transmit control signals that are shared between other standalone modules. The information on the SAE J1939 control link is used for control functions. Fault messages or diagnostic information also transmits across this link. These control signals may be for engine, transmission, brakes or a number of other vehicle control needs. The J1939 operates at 250,000 bits per second, which is approximately 26 times faster than the J1708/1587 data link. This higher speed allows the system to operate at a faster sampling rate and higher resolution, thus enabling better control of vehicle functions.

Terminating Resistors

Terminating resistors are wired to each end of the SAE J1939 data link to prevent signal reflections. They must remain connected for the data link to function properly. The resistance value of each termination resistor is 110–130 Ω. When properly installed in the data link, their combined resistance is 50–70 Ω since they are connected in parallel.

The termination resistor at one end of the SAE J1939 data link is located in the fuse/relay center (FRC) near the vehicle electronic control unit (VECU) and the other near the engine control module (ECM). On vehicles equipped with MACK engines, the termination resistor at the engine end is located inside the ECM. On vehicles equipped with Cummins engine, the termination resistor is located in the harness area just outside of the ECM.

A SAE J1939 data link connection is located at the transmission area in the chassis harness. On vehicles equipped with an electronically controlled transmission (Allison/Autoshift II/Meritor Freedom Line), the connection to the transmission is located at the chassis harness. On vehicles equipped with a manual non-electronically controlled transmission - the connector stub will have an un-terminated blanking plug installed.

Only two termination resistors are used in each data link. Never install more than two terminator resistors in one data link. If more than two resistors exist in the SAE J1939 data link circuit, incorrect or absent signals may occur. You can easily check to see if you have two resistors by measuring the resistance between pin C and D for the 9-pin diagnostic connector, or pin 3 and 11 for the 16-pin diagnostic connector, with the ignition key in OFF position. The correct resistance is 50 – 70 Ω. The termination resistors should each have a resistance of 110 – 130 Ω when tested individually.

Notes

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Electrical Wiring and Connections

Main Power and Starting Circuits

Figure 1 shows the starter circuits. Note that the EMS and VECU directly control the starter relay. The EMS inhibits starter for engine running, starter overheat and PTO. The VECU inhibits the starter mainly for transmission in gear.

Figure 2 shows the main power circuits. Ignition and “EMS” power are controlled by the VECU through relays. “EMS” power is connected after the key is turned on and remains on during crank and for some seconds after key off, mainly to service the Engine Management System. Ignition power is similar, but is disconnected during crank and supplies items not necessary for engine start. MACK conventional trucks actually have a second set of ignition circuits for items not normally needed for driving (e.g. Sleeper) which also supplies one of the Granite BodyLink III power pins indicated in Figure 7. The first and second power relays are also shut off at low voltage. The first relay powers off at a lower threshold than the second.

W3113939

Fig. 1 Main Power and Starting Circuit

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W0113940

Fig. 2 Battery & Ignition - Switched Supplies - Conventional Trucks

“IGN” circuits will be disconnected at LOW VOLTAGE and during STARTING.

“EMS” circuits remain powered while at key ON or CRANK and may remain powered at key OFF.

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Vehicle Control Unit (VECU) Connections

Fig. 3 Vehicle Control Unit (VECU) Connectors

Notes

W3088359

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Description of VECU Pin Layout

VECU Connector A (Green)

Pin Number Type Mack Name

PA-1 DI-H Cruise Control: Set/Decel

PA-2 DI-H Cruise Control: Resume/Accel

PA-3 DI-H Cruise Control: On/Off

PA-4 DI-H A/C On

PA-5 DI-H Service Brake

PA-6 DI-H Key Switch Crank

PA-7 DI-H

PA-8 DI-H Clutch

PA-9 DI-H Neutral

PA-10 DI-H Air Suspension Interlock

PA-11 DO-L (1A) DRL Control

PA-12

PA-13

PA-14 DI-H Key Switch Ignition

PA-15

PA-16

PA-17 DI-H CDS 2 switch / PTO 4

PA-18 DI-H IVS2 used for Volvo Automatic gearbox

PA-19 DI-H Fan Override

PA-20 DI-H Engine brake 2

PA-21 DI-H Engine brake 1

PA-22 DI-H EOL

PA-23 DI-H IVS 1

PA-24 DI-L

PA-25 DI-L Interwheel Lock

PA-26 DI-L 5th Wheel Slide Switch

PA-27 DI-L Remote Engine Shutdown

–

Battery ( + after PWR )

—

Ground

J1939 + BBM

J1939 – BBM

—

PA-28 DI-L Hood Tilt Switch

PA-29 DI-H PTO1

PA-30 DI-H DRL Override

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VECU Connector B (Blue)

Pin Number

PB-1 DO-L (1A) Power Relay #1 (load shedding)

PB-2 DO-L (1A) Power Relay #2 (load shedding)

PB-3 DO-L (1A) Interwheel Diff Lock

PB-4 DO-L (1A) 5th Wheel Slide Interlock /Regen Inhibited

PB-5 (12 v, 50 mA) Output Supply 4

PB-6 Frequency Input Vehicle Speed Sensor +

PB-7 DI-H PTO 2

PB-8 AI (4K) Throttle Pedal Signal

PB-9 AI (2 - 10K) Spare

PB-10 (5V, 10 mA) Output Supply 1, (T.P.)

PB-11 DI-L Parking Brake

PB-12 DI-L EB Steering wheel 1

PB-13 DI-L RH Operation

PB-14 AI (1.5-4K) Spare

PB-15 DO – L (0.2A) EMS Relay

Type

Mack Name

PB-16 DO-L (1A) Aux Fan

PB-17 DO – H (10 mA) Buffered IVS 1 (Only EMS)

PB-18 DO-L (1A) PTO output

PB-19 (12V, 70mA) Output Supply 3

PB-20 Frequency Input Vehicle Speed Sensor -

PB-21 DI-H CDS 1 / PTO 3

PB-22

PB-23

PB-24 AI (2 - 10K)

PB-25 (6.5-9V, 15mA) Output Supply 5

PB-26 (5V, 10 mA) Output Supply 2

PB-27 AI Spare

PB-28 DO – H ( 2A) Starter Control (ASSIST or starter protection)

PB-29 DI-L Door Switch

PB-30 DI-H Shut Down Override

—

Analog Ground

—

VECU Connector C (Green)

Pin Number Mack Name

PC-1 J1587 B

PC-2 J1587 A

PC-3

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—

Pin Number Mack Name

PC-4 J1939 H

PC-5 J1939 L

Remote Start n Stop

Note: This is only a suggestion for a body builder installed system.

W3121912

Fig. 4 Remote Start N Stop V-MAC IV

Note: Refer to “Remote Start N Stop V-MAC IV, Schematic Components” table for descriptions and part numbers.

Remote Start N Stop V-MAC IV, Schematic Components

Description Part Number

Relay 25171095

Relay Connector 20865681

Terminal Female 925AM22

Terminal Male 20865699

Secondary Lock 25154889

Switch Drive Position 25153559

Switch Drive Position Connector 21402299

Terminal Drive Position Switch 25091569

Park Brake Switch 25171211

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Remote Engine Stop

If a chassis was ordered with “Remote Engine Stop”, a relay is pre-installed in the harness. Installation of the push button switch is all that is required.

If installing “Remote Engine Stop” to a chassis (MRU / LR and Conventional Chassis’), relay P/N 25082390 must be installed in addition to installing the push button switch. Only MRU and LR models are pre-wired for the Remote Engine Stop.

Note: For Remote Engine Stop to work you must run an accessory kit and P/N 85137397 reprogram the VECU (Can only be done by a Dealer) and parameters need to be programmed. See “Remote Engine Stop” in the Body Builder, Parameter Programming service bulletin.

Note: The input to the VECU pin A27 (Green 30-way connector on VECU) is an active low digital input that must be attached to an isolated signal ground. DO NOT switch chassis/cab ground to pin A27 of the VECU. Interference from other components on the chassis/cab ground could cause an engine shutdown when not requested by the body builder.

Note: The switching of ground to an input that carries a very low current requires special switching equipment. It is recommended using a switch with gold contacts, or a relay to switch the signal ground to Pin A27 of the VECU. Gold resists corrosion on the contacts and relays have enough ‘swiping’ motion on the contacts to help keep them clean.

W3113955

Fig. 5 Remote Engine Stop

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Adding Auxiliary Accelerator Pedal

Below is a suggestion for adding an auxiliary accelerator pedal, based on the Mack LR dual steering solution.

The pedal is wired in parallel using a multi-pin selector switch. If the signal is not switched between the two accelerator pedals, a fault code may be generated due to high current at the throttle pedal signal input line (VECU B-8).

Note: See data link system before using such a device.

Note: An identical pedal is needed for the auxiliary sensor accelerator pedal because it requires an IVS signal. A substitute

type pedal may cause a fault code and is not recommended.

Fig. 6 Auxiliary Acceleration Pedal Signal

Note: Refer to “Auxiliary Acceleration Pedal Signal, Schematic Components” table for component ID(s) and descriptions.

Notes

W3113956

Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR

USA139388593 Date 7.2017 Electrical Wiring and Connections Page 25 (94)

BodyLink III

BodyLink III is the standard Mack Granite straight truck body builder electrical interface. It consists of a 29-pin electrical quick-connector and grounding stud mounted just under the rear of the cab (near BOC). BodyLink III includes an electrical pin-out label. Also available with BodyLink III is a cab pass-thru between the seats. Note that the carpeting or floor mate is not cut at the factory to avoid unnecessary noise if not used. Also available is a ‘BodyLamp’ dash light to indicate typically when the dump body is elevated. This lamp is activated via pin #17 when grounded. Also available with BodyLink III are assignable (can be labeled) dash switches. These switches output via pins 8 to 14 on the BodyLink III connector. A female connector and pins are included with BodyLink III, typically supplied in the cab with the sales and service literature packets.

Note: The BodyLink III BOC connector is supplied with the mating connector housing and terminal pins from the factory. If additional pins or connectors are required they can be purchased from your local Mack Dealer. The connector housing is 25177195 and the terminal kit is 21750652.

W3084959

Fig. 7 Granite BodyLink III Components

1 BodyLink III Connector

2 Pass-Thru

3 Switch

Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR

USA139388593 Date 7.2017 Electrical Wiring and Connections Page 26 (94)

Order Codes for Body Connections (Granite BodyLink III)

Item Sales Code Model Status Description

BodyLink III w/Cab

Pass-Thru

BodyLink III w/o Cab

Pass-Thru

BodyLamp

Six (6) Assignable

Switches

Notes

B83 0025

B83 0026

B66 0002

164 0012

GU7, GU8

Standard (Straight)

No cost option

Optional

29-pin under-cab connector, la-

bel, female connector, cab pass-

thru.

Same as above without pass-

thru.

9-pin back-of-cab power & light-

ing only

Six (6) assignable dash rocker

switches w/ labels (5 on-off, 1

momentary)

Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR

USA139388593 Date 7.2017 Electrical Wiring and Connections Page 27 (94)

Fig. 8 Granite BodyLink III Routing Beneath Driver Seat

1 Rubber Adhesive Tape

W3092527

W3092528

Fig. 9 Granite BodyLink III Cab Pass Through and Connector

1 Body Builder Harness

2 Gasket

3 Spacer

4 Nut, Panel

Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR

USA139388593 Date 7.2017 Electrical Wiring and Connections Page 28 (94)

Fig. 10 Granite BodyLink III 29-pin Connector, Wire Insertion Side of Connector.

Pin Chart for Granite BodyLink III 29-pin Connector

Pole Description

1 BATTERY POWER (30A)

2 IGNITION POWER (30A)

3 STOP LAMP

4 TAIL LAMP

6 LH TURN

7 RH TURN

8 AUX SWITCH #1 (IGN)

9 AUX SWITCH #2 (BATT)

10 AUX SWITCH #3 (IGN)

11 AUX SWITCH #4 (IGN)

12 AUX SWITCH #5 (IGN)

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REVERSE SIGNAL

13 AUX SWITCH #6 (DOWN)

14 AUX SWITCH #6 (UP)

15 PARK BRAKE

16 NEUTRAL SIGNAL

17 INDICATOR SWITCH (BODY LAMP)

18 (12v positive) PTO #1 – CA29

19 (12v positive) PTO #2 – CB7

20 (12v positive) SPEED CONTROL ON/OFF

21 BB J1939 +

22 BB J1939 -

23 (12v positive) SPEED CONTROL SET / DECEL

24 (12v positive) SPEED CONTROL RESUME / ACCEL

25 and 26

27 LH TURN/STOP

29 RH TURN STOP

Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR

USA139388593 Date 7.2017 Electrical Wiring and Connections Page 29 (94)

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