MSD 6421 User Manual

12 INSTALLATION INSTRUCTIONS
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MSD SYSTEMS With an MSD Timing Control (points or amplifier).
TRIGGER (IF USED)
OR
MSD CRANK
TRIGGER WHEEL
DISTRIBUTOR
WITH
MAGNETIC PICKUP
DISTRIBUTOR
SWITCH
12V
LINELOCK OR
TRANS BRAKE
SOLENOID
2-STEP REV
LIMITER CIRCUIT
TIMING
CONTROL
UNIT
TO GROUND
BLACK
INDICATES CONNECTION
•
IGNITION
KEY
TO 12V
RED
MAGNETIC PICKUP
(NOT USED)
+
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
+
ORANGE (TO COIL +)
BLACK (TO COIL -)
RED
GREEN (-)
VIOLET (+)
WHITE
BLUE
WHITE/BLUE
HALL-EFFECT
(NOT USED)
2-STEP/LAUNCH
(12V TO ACTIVATE)
RED
WHITE
YELLOW
WHITE
(NOT USED)
FROM IGNITION KEY
(ORIGINAL COIL + WIRE)
GRAY
TACH OUTPUT
MSD SYSTEMS Typical Drag Race Setup with Timing Control and Two Step Selector.
MOST TIMING
CONTROLS
TIMING
CONTROL
UNIT
CONTROL
KNOB
IGNITION
TM
MAGNETIC
PICKUP
(NOT USED)
TO GROUND
BLACK
INDICATES CONNECTION
•
IGNITION
KEY
TO 12V
RED
MAGNETIC PICKUP
(NOT USED)
+
HEAVY RED
HEAVY BLACK
TO BATTERY
TO BATTERY
+
ORANGE (TO COIL +)
BLACK (TO COIL -)
RED
GREEN (-)
VIOLET (+)
WHITE
BLUE
WHITE/BLUE
HALL-EFFECT
(NOT USED)
2-STEP/LAUNCH
(12V TO ACTIVATE)
RED
WHITE
YELLOW
WHITE
FROM
IGNITION KEY
(ORIGINAL COIL + WIRE)
FROM POINTS
OR ELECTRONIC
IGNITION AMPLIFIER
(ORIGINAL COIL -
WIRE)
GRAY
TACH OUTPUT

MSD 6421 Specifications

General

Brand	MSD
Model	6421
Category	Control Unit
Language	English