GM 4-Pin HEI Electronic Ignition Control Module Wiring Connections/Diagram with a Magnetic Pickup Coil

This electronic ignition system operates with full 12 volts. It is recommended only for ordinary lawn & garden equipment. In order for the engine to accelerate at full RPM, the magnetic pickup coil requires a high-output/performance 4-pin GM HEI module, 1.0 ohm ignition coil, metal core spark plug wire and a copper core spark plug gapped at .025". IMPORTANT: The coil and/or module may burn up if the ignition switch is left on for more than 5 minutes with the engine not running. (The module does NOT have a built-in timing retard.)

• Connect the White wire on the magnetic pickup coil to the [W] terminal on the module.
• Connect the Black wire on the magnetic pickup coil to the [G] terminal on the module. NOTE: Due to electrical polarity of certain magnetic pickup coils, it may be necessary to connect these two wires one way or the other so the engine will accelerate.
• Connect the ignition coil negative (–) terminal to the [C] terminal on the module. For competition pulling - if the grounding-type killswitch is used, connect the ungrounded wire from the killswitch to this terminal. Or for a generator engine, connect this terminal with a semiconductor rectifier diode to "excite" or temporarily energize the field windings in the generator.
• [B] terminal on the module connects to the ignition coil positive (+) terminal and to the ignition switch (battery positive (+) post).
• Mounting holes in the module body must be connected to engine/chassis ground (battery negative (–) post). When mounting the GM 4-pin HEI module, always fasten it with dielectric, thermal or heat sink grease/paste on a clean, flat aluminum plate with plenty of fresh air circulation to dissipate the heat while in operation.

Compliments of Brian Miller