MSD Ignition 8739 User manual

AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN DR., EL PASO, TEXAS 79936 • [phone] • FAX [phone]
MSD Module Selectors
Two Step, PN 8739
Three Step, PN 8737
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
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 correspond-
ing activation wire. The Selectors work with either a Soft Touch Rev Control or any MSD Timing
Control that uses plug-in modules.
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
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.

2 INSTALLATION INSTRUCTIONS
AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN DR., EL PASO, TEXAS 79936 • [phone] • FAX [phone]
Figure 3 Basic Three Step Installation.
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
3
MODULE3
AUTOTRONIC CONTROLS CORPORATION
1490 HENRY BRENNAN DR, EL PASO, TX 79936
TM
BLACK
TO
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
TO
GROUND
TO
GROUND
MODULE SELECTOR
STEP
MODULE 2 MODULE 1
PN 8739
AUTOTRONIC CONTROLS CORPORATION
1490 HENRY BRENNAN DR, EL PASO, TX 79936
TM
87A
87 NO
NC
C
86 85
30
Figure 2 Wiring a Two Step to a Latching Relay.

INSTALLATION INSTRUCTIONS 3
AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN DR., EL PASO, TEXAS 79936 • [phone] • FAX [phone]
Figure 4 Wiring a Three Step to a Timing Control for Multiple Retards.
PAR T NO.
AUTOTRONIC CONTROLS CORPORATION
SERIAL NO..
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
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
TM
Multiple
Spark
Discharge
MODULE 2 MODULE 1
PN 8737
MODULE SELECTOR
3
MODULE3
AUTOTRONIC CONTROLS CORPORATION
1490 HENRY BRENNAN DR, EL PASO, TX 79936
TM
+
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
+
Figure 5 Wiring a Three Step to a Shift Light for Multiple Shift Points.
SHIFT LIGHT
BLACK
TO GROUND
RED
GREEN
TO SWITCHED
12 VOLTS
TO
TACH OUTPUT
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
3
MODULE3
AUTOTRONIC CONTROLS CORPORATION
1490 HENRY BRENNAN DR, EL PASO, TX 79936
TM

AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN DR., EL PASO, TEXAS 79936 • [phone] • FAX [phone]
Limited Warranty
A utotronic Controls Corporation warrants MSD Ignition products to be free from defects in material
and workmanship under normal use and if properly installed for a period of one year from date of
purchase. If found to be defective as mentioned above, it will be replaced or repaired if returned prepaid
along with proof of date of purchase. This shall constitute the sole remedy of the purchaser and the sole
liability of Autotronic Controls Corporation. To the extent permitted by law, the foregoing is exclusive
and in lieu of all other warranties or representations whether expressed or implied, including any implied
warranty of merchantability or fitness. In no event shall Autotronic Controls Corporation be liable for
special or consequential damages.
FRM22502 Revised 03/01 Printed In U.S.A.
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 service, Proof of Purchase must be supplied for warranty
verification. After the warranty period has expired, repair service is charged based on a minimum and
maximum charge.
Send the unit prepaid with proof of purchase to the attention of: Customer Service Department,
Autotronic Controls Corporation, 12120 Esther Lama, Suite 114, El Paso, Texas 79936.
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 after receipt, COD for any charges. (Ground
shipping is covered by warranty). All units are returned regular UPS unless otherwise noted. For more
information, call the MSD Customer Service Line [phone]. MSD technicians are available from 8:00
a.m. to 5:00 p.m. Monday - Friday (Mountain Time).