6421 datasheet(14/28 Pages) MALLORY

14 / 28 page

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 Wiring with an MSD Wiring Harness.

HARNESS PN 8877

FACTORY HARNESS

(UNPLUGGED FROM COIL)

COIL

MAGNETIC PICKUP

(NOT USED)

HEAVY RED

HEAVY BLACK

TO BATTERY

GREEN (-)

VIOLET (+)

BLUE

WHITE/BLUE

HALL-EFFECT

(NOT USED)

2-STEP/LAUNCH

(12V TO ACTIVATE)

GRAY

TACH OUTPUT

Harness PN 8876 - Dual Connector Coil.

Harness PN 8877 - 1996-on GM Vehicles.

MSD SYSTEMS

Wiring with an MSD Power Grid

MSD

CAN

GREEN - STEP 5

LT. GREEN - STEP 4

TAN - STEP 3

VIOLET - STEP 2

PINK - STEP 1

BLUE - LAUNCH

LT. BLUE - BURN OUT

BRN/WHITE - RPM/TIME SWITCH

WHITE - POINTS IN (NOT USED)

GRAY - TACH

YELLOW - SHIFT LIGHT

GREEN

VIOLET

INDICATES CONNECTION

HEAVY RED

HEAVY BLACK

ORANGE

BLACK

V-NET

CABLE

LEGACY IGNITION

(NOT USED)

ORANGE

BLACK

BATTERY

POSITIVE

BATTERY

NEGATIVE

PN 8253

MAGNETIC PICKUP

(NOT USED)

FROM IGNITION KEY

(ORIGINAL COIL + WIRE)

IGNITION KEY

TO 12V

ORANGE (TO COIL +)

BLACK (TO COIL -)

RED

GREEN (-)

VIOLET (+)

WHITE

BLUE

GRAY

TACH OUTPUT

WHITE/BLUE

HALL-EFFECT

(NOT USED)

2-STEP/LAUNCH

(12V TO ACTIVATE)

RED

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