MSD 8739 Installation

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Page 1

Module 2 This is the default module. It is active when no voltage is present

on the other wires.

Active when 12 volts are applied to the Red Wire.

Active when 12 volts are applied to the Blue Wire. (3-Step Only)

Module 1

Note: If 12 volts are applied to the Red and Blue wires at the same time, Module 3

will be active.

Module 3

ACTIVATION WIRES

SWITCH OR

MICRO SWITCH

PN 8820

TO GROUND

TO 12V

RED

BLACK

TO MODULE SOCKET

TO LINE LOCK

OR TRANS-BRAKE

SOLENOID

MODULE SELECTOR

STEP

MODULE 2 MODULE 1

PN 8739

AUTOTRONIC CONTROLS CORPORATION

1490 HENRY BRENNAN DR, EL PASO, TX 79936

MSD Module Selectors

Two Step, PN 8739

Three Step, PN 8737

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Parts Included:

1 - Module Selector

1 - Parts Bag, Wiring Terminals

4 - Mounting Screws

Note: Do NOT use solid core spark plug wires with any MSD component.

The MSD Module Selectors provide the ability to switch between two or three different rpm or degree modules. The different modules are activated when 12 volts are applied to the corresponding activation wire. The Selectors work with either a Soft Touch Rev Control or any MSD Timing Control that uses plug-in modules.

•The 2-Step Module Selector switches between two modules.

•The 3-Step Module Selector switches between three modules.

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Figure 1 Basic Two Step Module Selector Installation.

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2 INSTALLATION INSTRUCTIONS

T A C H

C+

C-

IGN

PTS

M+

M-

GROUND

RPM

TO GROUND

TO 12V

MODULE 2 - ACTIVE WITH NO VOLTAGE. MODULE 1 - ACTIVE WITH 12 VOLTS ON RED WIRE. MODULE 3 - ACTIVE WITH 12 VOLTS ON BLUE WIRE. THIS

MODULE WILL ALSO BE ACTIVE IF 12 VOLTS ARE SUPPLIED TO THE RED AND BLUE WIRES.

TO 12V

CLUTCH SWITCH

MSD MICRO SWITCH

PN 8820

BLUE

RED

BLACK

TO LINE LOCK

OR TRANS-BRAKE

SOLENOID

MODULE 2 MODULE 1

PN 8737

MODULE SELECTOR

MODULE 3

AUTOTRONIC CONTROLS CORPORATION

1490 HENRY BRENNAN DR, EL PASO, TX 79936

BLACK

GROUND

RELAY

PN 8961

RED

JUMPER

(+) 12V

CLUTCH SWITCH

LINE LOCK SOLENOID

REV LIMITER

(+) 12V

IF YOUR APPLICATION REQUIRES USING THE CLUTCH FOR EVERY SHIFT, THIS DIAGRAM WILL PROVIDE A REV LIMIT ON THE LAUNCH ONLY AND HOLD THE LINE LOCK ON UNTIL THE CLUTCH PEDAL IS RELEASED.

MOMENTARY

PUSH BUTTON

SWITCH

GROUND

MODULE SELECTOR

STEP

MODULE 2 MODULE 1

PN 8739

AUTOTRONIC CONTROLS CORPORATION

1490 HENRY BRENNAN DR, EL PASO, TX 79936

87A

Figure 2 Wiring a Two Step to a Latching Relay.

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Figure 3 Basic Three Step Installation.

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INSTALLATION INSTRUCTIONS 3

TACH OUTPUT

MAGNETIC

PICKUP

(NOT USED)

WHITE WIRE

TO POINTS OR

AMPLIFIER

IF USED

TO MAGNETIC

PICKUP

TRIGGER

IF USED

YELLOW

BLACK

(NOT USED)

WHITE

RED

GRAY

RED

BLUE

SWITCH +12V TO ACTIVATE

SECOND RETARD

SWITCH +12V TO ACTIVATE

THIRD RETARD

FIRST RETARD

IGNITION KEY

+12 VOLTS

WHEN GRAY WIRE IS GROUND THERE IS NO RETARD, OPEN SWITCH TO RETARD.

BLACK

TO GROUND

WHITE

TIMING COMPUTER

PN 8980

PN 8737

BLACK

FIRST

RETARD

THIRD

RETARD

SECOND

RETARD

ORANGE

RED

BLACK

COIL

IGNITION

Multiple

Spark

Discharge

MODULE 2 MODULE 1

PN 8737

MODULE SELECTOR

AUTOTRONIC CONTROLS CORPORATION

1490 HENRY BRENNAN DR, EL PASO, TX 79936

HEAVY RED

HEAVY BLACK

TO BATTERY

RED

BLUE

SWITCH +12V TO ACTIVATE

SECOND SHIFT POINT

SWITCH +12V TO ACTIVATE

THIRD SHIFT POINT

PN 8737

BLACK

FIRST

SHIFT POINT

THIRD SHIFT POINT

SECOND SHIFT POINT

MODULE 2 MODULE 1

PN 8737

MODULE SELECTOR

MODULE 3

AUTOTRONIC CONTROLS CORPORATION

1490 HENRY BRENNAN DR, EL PASO, TX 79936

AUTOTRONIC CONTROLS CORPORATION

PART NO.

SERIAL NO..

Figure 4 Wiring a Three Step to a Timing Control for Multiple Retards.

SHIFT LIGHT

BLACK

RED

TO SWITCHED

12 VOLTS

GREEN

TACH OUTPUT

Figure 5 Wiring a Three Step to a Shift Light for Multiple Shift Points.

TO GROUND

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TECH NOTES

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Service

In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty. When returning MSD components for warranty service, Proof of Purchase must be supplied for veriﬁcation. After the warranty period has expired, repair service is based on a minimum and maximum fee. All returns must have a Return Material Authorization (RMA) number issued to them before being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or visit our website at www.msdperformance.com/rma to automatically obtain a number and shipping information. When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to include a detailed account of any problems experienced, and what components and accessories are installed on the vehicle. The repaired unit will be returned as soon as possible using Ground shipping methods (ground shipping is covered by warranty). For more information, call MSD at (915) 855-7123. MSD technicians are available from 7:00 a.m. to 5:00 p.m. Monday - Friday (mountain time).

Limited Warranty

SD warrants this product to be free from defects in material and workmanship under its intended normal use*, when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date of the original purchase. This warranty is void for any products purchased through auction websites. If found to be defective as mentioned above, it will be repaired or replaced at the option of MSD. Any item that is covered under this warranty will be returned free of charge using Ground shipping methods. This shall constitute the sole remedy of the purchaser and the sole liability of MSD. To the extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied, including any implied warranty of merchantability or ﬁtness. In no event shall MSD or its suppliers be liable for special or consequential damages. *Intended normal use means that this item is being used as was originally intended and for the original application as sold by MSD. Any modiﬁcations to this item or if it is used on an application other than what MSD markets the product, the warranty will be void. It is the sole responsibility of the customer to determine that this item will work for the application they are intending. MSD will accept no liability for custom applications.

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FRM28948 Revised 01/12 Printed in U.S.A.

MSD 8739 Installation

Specifications and Main Features

Frequently Asked Questions

User Manual