MSD 6430 6ALN Ignition Control Installation - Manual (Page 5)

INSTALLATION INSTRUCTIONS 
M S D I G N I T I O N
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Grounds: A poor ground connection can cause many frustrating problems. When a wire is specified
to go to ground, it should be connected to the battery negative terminal, engine block or chassis.
There should always be a ground strap between the engine and the chassis. Always securely connect
the ground wire to a clean, paint free metal surface.
Ballast Resistor: If your vehicle has a ballast resistor in line with the coil wiring, it is recommended
to bypass it.
rOuTINg WIres
The MSD wires should be routed away from direct heat sources such as exhaust manifolds and
headers and any sharp edges. The trigger wires should be routed separate from the other wires
and spark plug wires. It is best if they are routed along a ground plane such as the block or firewall
which creates an electrical shield. The magnetic pickup wires should always be routed separately
and should be twisted together to help reduce extraneous interference.
WIre FuNCTIONs
These are the two heavy gauge wires (12 gauge) and are responsible for
getting direct battery voltage to the Ignition. The ignition has an internal fuse
so no fuse is necessary.
This wire connects directly to the battery positive (+) terminal or to a positive
battery junction or the positive side of the starter solenoid.
Note: Never connect the alternator.
This wire connects to a good ground, either at the battery negative (-) terminal
or to the engine.
Connects to a switched 12 volt source. Such as the ignition key or switch.
Connects to the positive (+) terminal of the coil.
This is the only wire that makes electrical contact with the coil positive
terminal.
Connects to the negative (-) terminal of the coil.
This is the only wire that makes electrical contact with the coil negative
terminal.
There are two circuits that can be used to trigger the MSD Ignition; a Points
circuit (White wire) and a Magnetic Pickup circuit (Violet and Green wires).
The two circuits will never be used together.
This wire is used to connect to the points, electronic ignition amplifier output
or to the Yellow wire of an MSD Timing Accessory. When this wire is used,
the Magnetic Pickup connector is not used.
These wires are routed together in one harness to form the Magnetic Pickup
connector. The connector plugs directly into an MSD Distributor or Crank
Trigger. It will also connect to factory magnetic pickups or other aftermarket
pickups. The Violet wire is positive (+) and the Green is negative (-). When
these wires are used, the White wire is not.
PoWER LEADS
HEAvy RED
HEAvy BLACk
RED
oRANGE
BLACk
TRIGGER
WIRES
WHITE
vIoLET
AND GREEN
(MAGNETIC
PICkuP
CoNNECToR)