6421 datasheet(15/28 Pages) MALLORY

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INSTALLATION INSTRUCTIONS

MSD • W W W. M S D PE R F OR M A NC E . C OM • ( 91 5 ) 8 55 - 7 12 3 • F AX ( 91 5 ) 8 57 - 33 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 MODULEINSTALL HARNESS

MAGNETIC

PICKUP

CONNECTOR

TO ENGINE

GROUND

ORANGE

ORANGE*

BLACK*

PN 8861

HARNESS

RED

HEAVY RED

HEAVY BLACK

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.

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