MSD Module Selectors
Two Step, PN 8739
Three Step, PN 8737
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Parts Included: |
1 - Parts Bag, Wiring Terminals |
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- Module Selector |
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4 |
- Mounting Screws |
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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.
ACTIVATION WIRES
Module 2 This is the default module. It is active when no voltage is present on the other wires.
Module 1 Active when 12 volts are applied to the Red Wire.
Module 3 Active when 12 volts are applied to the Blue Wire. (3-Step Only)
Note: If 12 volts are applied to the Red and Blue wires at the same time, Module 3 will be active.
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TO MODULE SOCKET |
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MICRO SWITCH |
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PN 8820 |
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SWITCH OR |
TO 12V |
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RED |
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STEP |
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MODULE SELECTOR |
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TM |
TO LINE LOCK |
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PN 8739 |
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OR TRANS-BRAKE |
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AUTOTRONIC CONTROLS CORPORATION |
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1490 HENRY BRENNAN DR, EL PASO, TX 79936 |
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BLACK |
MODULE 2 |
MODULE 1 |
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SOLENOID |
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TO GROUND |
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Figure 1 Basic Two Step Module Selector Installation.
M S D • W W W . M S D P E R F O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
2 |
INSTALLATION INSTRUCTIONS |
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REV LIMITER
RED
TO |
JUMPER |
GROUND |
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87 NO |
CLUTCH |
86 87A NC 85 |
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SWITCH |
30 C |
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RELAY |
(+) 12V |
PN 8961 |
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.
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STEP |
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MODULE SELECTOR |
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TM |
BLACK |
PN 8739 |
1490 HENRY BRENNAN DR, EL PASO, TX 79936 |
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AUTOTRONIC CONTROLS CORPORATION |
MODULE 2 MODULE 1
TO
GROUND
(+) 12V
MOMENTARY
PUSH BUTTON
SWITCH
LINE LOCK 
SOLENOID
TO
GROUND
Figure 2 Wiring a Two Step to a Latching Relay.
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
RED
TO LINE LOCK
OR TRANS-BRAKE
SOLENOID
TO 12V
CLUTCH SWITCH
MSD MICRO SWITCH
PN 8820
C+
C-
RPM
IGN
AT PTS
CH M+
GROUND 
M-
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3 |
TM |
3 |
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MODULE SELECTOR |
MODULE |
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PN 8737 |
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AUTOTRONIC CONTROLS CORPORATION |
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1490 HENRY BRENNAN DR, EL PASO, TX 79936 |
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BLUE |
MODULE 2 |
MODULE 1 |
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BLACK
TO GROUND
Figure 3 Basic Three Step Installation.
M S D • W W W . M S D P E R F O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
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