6421 datasheet(10/28 Pages) MALLORY

10 / 28 page

INSTALLATION INSTRUCTIONS

MSD • W W W. M S D PE R F OR M A NC E . C OM • ( 91 5 ) 8 55 - 7 12 3 • F AX ( 91 5 ) 8 57 - 33 4 4

MAGNETIC PICKUP

(NOT USED)

FROM POINTS

OR ELECTRONIC

IGNITION AMPLIFIER

(ORIGINAL COIL - WIRE)

FROM IGNITION KEY

(ORIGINAL COIL + WIRE)

IGNITION KEY

TO 12V

HEAVY RED

HEAVY BLACK

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)

MSD SYSTEMS Installing to Points/Amplifier Style Ignition.

NOTE: On dual point setups, it is recommended

to remove the trailing set of points.

GREEN

PN 8860 HARNESS

VIOLET

DISTRIBUTOR

WITH

MAGNETIC PICKUP

MSD CRANK

TRIGGER WHEEL

DISTRIBUTOR

IGNITION KEY

TO 12V

HEAVY RED

HEAVY BLACK

TO BATTERY

ORANGE (TO COIL +)

BLACK (TO COIL -)

RED

WHITE

BLUE

WHITE/BLUE

HALL-EFFECT

(NOT USED)

2-STEP/LAUNCH

(12V TO ACTIVATE)

(NOT USED)

GRAY

TACH OUTPUT

MSD SYSTEMS Installing to an MSD Distributor/Crank Trigger.

NOTE: Ballast Resistor is not necessary.

NOTE: Remove the coil terminal wires. The negative wire

connects to MSD White.The positive wire connects

to MSD Red. The MSD Orange connects to the

coil positive terminal, Black connects to the coil

negative terminal.

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