MSD 6421 6AL-2 Ignition Control Installation - Manual (Page 15)

INSTALLATION INSTRUCTIONS 15
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 5 - 7 1 2 3 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
GM IGNITIONS GM Large Cap HEI Distributors
FOUR PIN
SEVEN PIN
FIVE PIN
There are three different large cap HEI distributors. To identify which
of the following diagrams fit your specific application, remove the
distributor cap and rotor and locate the ignition module at the base
of the distributor. Count the number of terminals on both ends of
the module and follow the corresponding diagram. GM used 4, 5,
and 7-pin modules in these distributors.
NOTE: Some 5-pin models may experience a hesitation or stall
on deceleration. If this occurs, contact MSD Tech Line
for the required bolt-in diode to correct the problem. MSD
Tech Line (915) 855-7123.
GM IGNITIONS Wiring an HEI 4-pin Module (Magnetic Pickup Trigger).
PN 8860
HARNESS
WHITE
JUMPER
KEY
CONNECTOR
HEAVY RED
OR PINK WIRE
FROM CAR
WIRING HARNESS
*ORANGE - CONNECTS TO B+
*BLACK - CONNECTS TO C-
CONDENSER
GM-CABLE
HARNESS GM MODULE
GROMMET
WIRE CLAMPS
REMOVE MODULE INSTALL HARNESS
MAGNETIC
PICKUP
CONNECTOR
TO ENGINE
GROUND
ORANGE
ORANGE*
*
BLACK*
BLACK*
PN 8861
HARNESS B+ GN
D C-
RED RED
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
+
GREEN (-)
VIOLET (+)
BLUE
WHITE/BLUE HALL-EFFECT
(NOT USED)
2-STEP/LAUNCH
(12V TO ACTIVATE)
WHITE
(NOT USED)
COVER WITH TAPE
GRAY
TACH OUTPUT
NOTE: The GM Ignition Module and condenser are removed
and replaced with the supplied PN 8861 Harness.