Parts Included:

1 - Module Selector

4 - Mounting Screws

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

1 - Parts Bag, Wiring Terminals

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

MODULE 2

MODULE 1

PN 8739

AUTOTRONIC CONTROLS CORPORATION

1490 HENRY BRENNAN DR, EL PASO, TX 79936

TM

        Figure 1 Basic Two Step Module Selector Installation.

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

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

MSD Module Selectors

Two Step, PN 8739

Three Step, PN 8737

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 activa-

tion wire. The Selectors work with either a Soft Touch Rev Control or any MSD Timing Control that

uses plug-in modules.

ONLINE PRODUCT REGISTRATION: Register your MSD product online and you’ll be entered

in our monthly 8.5mm Super Conductor Spark Plug Wire give-away! Registering your product

will help if there is ever a warranty issue with your product and helps the MSD R&D team create

new products that you ask for! Go to www.msdignition.com/registration.