MSD 6421 User Manual

INSTALLATION INSTRUCTIONS 23
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GREEN (-)
VIOLET (+)
ECT
SENSOR
WHITE
ORANGE TO AC INPUT
YELLOW
NOT USED
MAG PICKUP
NOT USED
Orange (+) and Black (-)
are the only wires that
connect to the coil.
GRAY
*Do NOT connect the small Red wire to the coil (+)
terminal when using an MSD Ignition or other CD
ignition control.
PINK - FAN 2 PROVIDES GROUND
TAN - FAN 1 PROVIDES GROUND
RED - IGNITION SWITCHED 12V
*
FUEL
PUMP
BLACK - GROUND
HEAVY RED - BATTERY
O2
SENSOR
BLACK
GROUND
HEAVY ORANGE
RED - IGNITION SWITCHED 12V
INDICATES CONNECTION
TO 12V
IGNITION
KEY
TO NITROUS 12V
ACTIVATION WIRE
INDICATES CONNECTION
(NOT USED)
+
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
+
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)
WIRING ATOMIC WITH PN 6421

MSD 6421 Specifications

General

Brand	MSD
Model	6421
Category	Control Unit
Language	English