MSD 6421 - Atomic EFI System Wiring; Wiring: Atomic PN 6421 with Timing Control

24 INSTALLATION INSTRUCTIONS
MSD • WWW.MSDPERFORMANCE.COM • (915) 855-7123 • FAX (915) 857-3344
GREEN (-)
VIOLET (+)
ECT
SENSOR
WHITE NOT USED
ORANGE TO AC INPUT
YELLOW
MAG
PICKUP
Orange (+) and Black (-)
are the only wires that
connect to the coil.
*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
+
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTER
Y
+
ORANGE (TO COIL +)
BLACK (TO COIL -)
RED
WHITE
BLUE
GRAY
TACH OUTPUT
WHITE/BLUE
HALL-EFFECT
(NOT USED)
2-STEP/LAUNCH
(12V TO ACTIVATE)
GREEN (-)
VIOLET (+)
MAGNETIC PICKUP
(NOT USED)
GREEN (-)
VIOLET (+)
WIRING ATOMIC WITH PN 6421 TO USE WITH TIMING CONTROL