MSD Ignition 8739 Installation Instructions

MSD Ignition 8739 Installation Instructions

Module selectors

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P a r t s I n c l u d e d :
1 - Module Selector
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 activa-
tion 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.
Module 2
Module 1
Module 3
Note: If 12 volts are applied to the Red and Blue wires at the same time, Module 3
will be active.
MICRO SWITCH
PN 8820
SWITCH OR
TO LINE LOCK
OR TRANS-BRAKE
SOLENOID
M S D
I G N I T I O N
MSD Module Selectors
Two Step, PN 8739
Three Step, PN 8737

ACTIVATION WIRES

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)
TO MODULE SOCKET
TO 12V
RED
TO GROUND
        Figure 1 Basic Two Step Module Selector Installation.
• w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • FA X ( 9 1 5 ) 8 5 7 - 3 3 4 4
1 - Parts Bag, Wiring Terminals
BLACK
STEP
MODULE SELECTOR
TM
PN 8739
AUTOTRONIC CONTROLS CORPORATION
1490 HENRY BRENNAN DR, EL PASO, TX 79936
MODULE 2
MODULE 1

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Summary of Contents for MSD Ignition 8739

  • Page 1 MSD Module Selectors Two Step, PN 8739 Three Step, PN 8737 P a r t s I n c l u d e d : 1 - Module Selector 1 - Parts Bag, Wiring Terminals 4 - Mounting Screws Note: Do NOT use solid core spark plug wires with any MSD component.
  • Page 2 INSTALLATION INSTRUCTIONS REV LIMITER STEP MODULE SELECTOR PN 8739 BLACK AUTOTRONIC CONTROLS CORPORATION 1490 HENRY BRENNAN DR, EL PASO, TX 79936 MODULE 2 MODULE 1 JUMPER GROUND GROUND (+) 12V MOMENTARY CLUTCH SWITCH PUSH BUTTON SWITCH RELAY PN 8961 (+) 12V...
  • Page 3 INSTALLATION INSTRUCTIONS TO MAGNETIC WHITE WIRE TIMING COMPUTER PICKUP TO POINTS OR PN 8980 TRIGGER AMPLIFIER BLUE SWITCH +12V TO ACTIVATE IF USED IF USED THIRD RETARD SWITCH +12V TO ACTIVATE BLACK SECOND RETARD THIRD RETARD MODULE SELECTOR PN 8737 AUTOTRONIC CONTROLS CORPORATION 1490 HENRY BRENNAN DR, EL PASO, TX 79936 FIRST RETARD PN 8737...
  • Page 4: Limited Warranty

    *Intended normal use means that this item is being used as was originally intended and for the original application as sold by MSD Ignition. Any modifications to this item or if it is used on an application other than what MSD Ignition markets the product, the warranty will be void.

This manual is also suitable for:

8737

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