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INSTALLATION INSTRUCTIONS

WIRING

Ignition supply wire. Connects to battery positive (+) terminal or battery junction.

Note: Do not connect to the alternator.

Ignition supply Ground wire. Connect to battery negative (-) terminal or engine block.

Red

On/Off switch wiring. Connects to a switched 12 volt source.

Primary Coil Leads

Orange

Connects to the coil positive (+) terminal. This is the only wire that makes contact to

the coil positive terminal.

Black

Connects to the coil negative (-) terminal. This is the only wire that makes contact to

the coil negative terminal.

WARNING: High voltage is present at the coil primary terminals. Do not touch the coil or

connect test equipment to the terminals while the engine is running or cranking.

Green

2-Pin

Heavy

Red

Heavy

Black

MULTIPLE SPARKS

The MSD produces full power multiple sparks for each firing of a plug. The number of multiple sparks that occur

decreases as rpm increases, however the spark series always lasts for 21° of crankshaft rotation. Above 3,300 rpm

there is simply not enough “time” to fire the spark plug more than once, so there is only one powerful spark.

PROTECTION

The MSD Programmable Digital-7 Plus has a built in reverse polarity protection circuit. This will protect the ignition

in the event of wrong connections. It will also shut off for protection from a surge in power. The ignition will still

operate once the surge or polarity is corrected.

LED INDICATOR

There is an LED that monitors the status of the Ignition. The LED will verify trigger inputs and will flash trouble

codes such as a Code 2-blinks for No Cam Sync or Code 3-blinks for Low Battery supply voltage.

CAMSHAFT SYNCHRONIZATION

This is used only in applications where the individual cylinder timing is going to be used. The 2-pin connector

with a Light Blue and Light Green wire connects to a sensor that is used to synchronize or alert the Ignition as to

when the number one cylinder is going to be triggered. With this information, the Ignition knows which cylinder

is being fired allowing for the individual cylinder timing capabilities. MSD offers two kits to use for sync signals:

Universal Cam Sync Sensor, PN 2346 and a Fiber Optic Inductive Pickup Kit, PN 7555.

Trigger Wires

Violet/

Magnetic pickup, 2-pin connector. Plugs into an MSD Distributor or Crank Trigger

pickup. Violet is positive, Green is negative. Note: When this connector is used, the

White wire is not connected.

White

Trigger input for electronic ignition amplifiers, an ECU’s trigger or points.

Note: When this wire is used, the magnetic pickup wire is not connected.

Tach Output

Gray

Tach output. This wire will provide the same 12 volt square wave tach signal as the

tach terminal on the side of the unit.