MSD 6421 - GM Ignition Wiring Diagrams; Wiring: GM Dual Connector Coil; Wiring: 1996+ GM Single Connector Coil

INSTALLATION INSTRUCTIONS 13
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GM IGNITIONS Wiring a Dual Connector Coil.
BOTH
PINKS
BOTH
PINKS
BOTH
WHITES
BOTH WHITES
WHITE
RED
INDICATES CONNECTION
RED
RED
MAGNETIC PICKUP
(NOT USED)
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
+
ORANGE
BLACK
GREEN (-)
VIOLET (+)
BLUE
WHITE/BLUE
HALL-EFFECT
(NOT USED)
2-STEP/LAUNCH
(12V TO ACTIVATE)
GRAY
TACH OUTPUT
NOTE: If the vehicle is not equipped with a factory
tach, there will only be one white wire
going to the coil.
NOTE: MSD offers a direct plug in harness,
PN 8876, that makes this a splice free
installation.
COIL
WIRE
A
(PINK)
WIRE
A
(PINK)
WIRES
B AND C
WIRES
B AND C
FACTORY HARNESS
(CUT FROM COIL)
MAGNETIC PICKUP
(NOT USED)
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
+
RED
GREEN (-)
VIOLET (+)
WHITE
BLACK
ORANGE
BLUE
WHITE/BLUE
HALL-EFFECT
(NOT USED)
2-STEP/LAUNCH
(12V TO ACTIVATE)
GRAY
TACH OUTPUT
NOTE: MSD offers a direct plug in harness,
PN 8877, that makes this a splice free
installation.
GM IGNITIONS Wiring the 1996 and up single connector coil without harness.
NOTE: The coil connector is labeled A-B-C. The wire in the
A port is positive (pink). The wires in B and C are coil
negative wires, color will vary by application.