6421 Datasheet, PDF (14/28 Pages) Mallory performance club – The MSD produces full power multiple sparks for each firing of a plug

14
INSTALLATION INSTRUCTIONS
  GM IGNITIONS  Wiring with an MSD Wiring Harness.
FACTORY HARNESS
(UNPLUGGED FROM COIL)
HARNESS PN 8877
2-STEP/LAUNCH ^BLUE
(12V TO ACTIVATE)
HALL-EFFECT ^WHITE/BLUE
(NOT USED)
HEAVY RED
TO BATTERY
GRAY
HEAVY BLACK
TO BATTERY
TACH OUTPUT
MAGNETIC PICKUP
(NOT USED)
GREEN (-)
VIOLET (+)
COIL
Harness PN 8876 - Dual Connector Coil.
Harness PN 8877 - 1996-on GM Vehicles.
  MSD SYSTEMS  Wiring with an MSD Power Grid
2-STEP/LAUNCH BLUE
(12V TO ACTIVATE)
HALL-EFFECT
(NOT USED)
WHITE/BLUE
MAGNETIC PICKUP
(NOT USED)
GREEN (-)
VIOLET (+)
INDICATES CONNECTION
GRAY
TACH OUTPUT
RED
WHITE
ORANGE (TO COIL +)
BLACK (TO COIL -)
PN 8253
V-NET
CABLE
HEAVY RED
HEAVY BLACK
ORANGE
BATTERY
POSITIVE
BATTERY
NEGATIVE
BLACK
MSD
CAN
- BLACK
+ ORANGE
YELLOW - SHIFT LIGHT
GRAY - TACH
BRN/WHITE - RPM/TIME SWITCH
RED
LEGACY IGNITION
(NOT USED)
LT. BLUE - BURN OUT
BLUE - LAUNCH
WHITE - POINTS IN (NOT USED)
PINK - STEP 1
VIOLET - STEP 2
TAN - STEP 3
LT. GREEN - STEP 4
GREEN - STEP 5
TO 12V
IGNITION KEY
FROM IGNITION KEY
(ORIGINAL COIL + WIRE)
GREEN
VIOLET
GREEN
VIOLET
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