4

INSTALLATION INSTRUCTIONS

WIRING

GENERAL WIRING INFORMATION

Wire Length: All of the wires of the MSD Ignition may be shortened as long as quality connectors

are used or soldered in place. To lengthen the wires, use one size bigger gauge wire (12 gauge for

the power leads and 16 gauge for the other wires) with the proper connections. All connections must

be soldered and sealed.

These are the two heavy 14 gauge wires and are responsible for

getting direct battery voltage to the ignition. The Ignition is load

protected from reverse battery connections and will automatically

shut down if there is over 28 volts input.

This wire connects directly to the battery positive (+) terminal or a

positive battery junction such as the starter solenoid.

Note: Do not

connect to the alternator.

This wire connects to a good ground, either at the battery negative

(-) terminal or to the engine.

Power Leads

Heavy Red

Heavy Black

Accessories

Blue

Gray

Red

Orange

Black

Trigger

Wires

White

White/Blue

Violet

and Green

(Magnetic

Pickup

Connector)

This wire is responsible for turning the MSD On and Off. Connects to

a switched 12 volt source such as the ignition key or switch.

This wire connects to the coil positive (+) terminal. This is the

ONLY

wire that makes electrical contact with the positive coil terminal.

This wire connects to the coil negative (-) terminal. This is the

ONLY

wire that makes electrical contact with the negative coil terminal.

There are three circuits that can be used to trigger the MSD Ignition;

a Points circuit (the White wire), a Magnetic Pickup circuit (the Green

and Violet wires), and a Hall-effect wire (White/Blue). Only one circuit

will be used at a time.

This wire is used to connect to breaker points, electronic ignition

amplifier output or to the Yellow wire of an MSD Timing Accessory.

When this wire is used, the White/Blue wire and Magnetic Pickup

connector are not used.

Hall-effect Trigger. This wire connects to the trigger wire of a Hall-

effect pickup.

When used, the White and Magnetic Pickup wires

are not used.

These wires are routed together in one harness as the magnetic pickup

connector. The connector plugs directly into an MSD distributor or

crank trigger. It will also connect to aftermarket pickups. The Violet

wire is positive (+) and the Green wire is negative (-).

When these

wires are used, the White or White/Blue wires are not.

This wire activates the Two Step Rev Control. When 12 volts is applied

to this wire, the low rpm limit is activated. When 12 volts is removed,

the rev limit returns to the high limit.

Tach output wire. Connects to the tachometer trigger wire or other

rpm activated device.