6421 Datasheet, PDF (15/28 Pages) Mallory performance club – The MSD produces full power multiple sparks for each firing of a plug

INSTALLATION INSTRUCTIONS
15
  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 [phone].
  GM IGNITIONS  Wiring an HEI 4-pin Module (Magnetic Pickup Trigger).
NOTE: The GM Ignition Module and condenser are removed
and replaced with the supplied PN 8861 Harness.
REMOVE MODULE
INSTALL HARNESS
CONDENSER
GROMMET
2-STEP/LAUNCH ^BLUE
(12V TO ACTIVATE)
GM-CABLE
HARNESS
GM MODULE
WIRE CLAMPS
HALL-EFFECT ^WHITE/BLUE
(NOT USED)
RED
HEAVY RED
TO BATTERY
HEAVY BLACK
TO BATTERY
WHITE
JUMPER
RED
KEY
CONNECTOR
GRAY _{TACH OUTPUT}
TO ENGINE
GROUND
WHITE
(NOT USED)
COVER WITH TAPE
BLACK*
ORANGE*
PN 8861
HARNESS
CG- ^NDB+
HEAVY RED
OR PINK WIRE
FROM CAR
WIRING HARNESS
GREEN (-)
VIOLET (+)
MAGNETIC
PICKUP
CONNECTOR
PN 8860
HARNESS
BLACK*
ORANGE*
*ORANGE - CONNECTS TO B+
*BLACK - CONNECTS TO C-
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