MSD 6421 User Manual

18 INSTALLATION INSTRUCTIONS
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FORD IGNITIONS Wiring a Ford TFI with Harness, PN 8874.
COIL
+
ORANGE
BLACK
MSD HARNESS PN 8874
FACTORY HARNESS
(UNPLUGGED 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
RED
WHITE
BLACK
ORANGE
NOTE: Installation of a Timing Control with the Harness, see page 15.
CHRYSLER IGNITIONS Wiring a Chrysler Electronic Ignition using Magnetic Pickup Trigger.
+
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
+
ORANGE (TO COIL +)
BLACK (TO COIL -)
RED
GREEN (-)
VIOLET (+)
BLUE
WHITE/BLUE
HALL-EFFECT
(NOT USED)
2-STEP/LAUNCH
(12V TO ACTIVATE)
FROM ORIGINAL
COIL TERMINAL
+
MAGNETIC PICKUP
CONNECTOR
DISTRIBUTOR
VIOLET
BLACK (M-)
ORANGE (M+)
GREEN
CHRYSLER MODULE
LEAVE DISCONNECTED
+
WHITE
(NOT USED)
GRAY
TACH OUTPUT

MSD 6421 Specifications

General

Brand	MSD
Model	6421
Category	Control Unit
Language	English