MSD 6520 Digital 6-Plus Ignition Control Installation - Manual (Page 16)

16 INSTALLATION INSTRUCTIONS
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GM IGNITIONS GM Large Cap HEI Distributors
There are three different large cap HEI distributors. To indentify
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
RED
KEY
CONNECTOR
TO ENGINE
GROUND
HEAVY RED
OR PINK WIRE
FROM CAR
WIRING HARNESS
WHITE
(NOT USED)
COVER WITH TAPE
ORANGE*
*ORANGE - CONNECTS TO B+
*BLACK - CONNECTS TO C-
BLACK*
PN 8861
HARNESS
CONDENSER
GM-CABLE
HARNESS GM MODULE
GROMMET
WIRE CLAMPS
REMOVE MODULE INSTALL HARNESS
B+ GN
D C-
MAGNETIC PICKUP
CONNECTOR
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
IGNITION
TM DIGITAL-6 PN 6520 PROGRAMMABLE 2 STAGE REV-LIMITER STEP RETARD CAPACITIVE DISCHARGE IGNITION
Plus
+
NOTE: The GM Ignition Module and condenser are removed
and replaced with the MSD PN 8861 Harness.