GM 4-Pin HEI Electronic Ignition Control Module Wiring Connections/Diagram with the Cube-Shaped 3-Wire Inductive Proximity Sensor

This ignition system operates with full 12 volts. This is a thoroughly tested, researched and proven reliable ignition system invented by Brian Miller for ordinary lawn & garden engines and competition pulling engines. With most tractors, the ignition conversion can be made with the engine in the tractor. The only modifications that need to be done is the flywheel shroud needs to be loosened to access and replace the Trigger Module, and two holes will need to be drilled and tapped with the 2 supplied screws in the kit. To install this replacement ignition system; the ignition coil mounts in place of the Breakerless Ignition coil; the proximity cube sensor/bracket mounts in place of the Breakerless Ignition Trigger Module, which is located at the 10:30 position on the bearing plate; and two 9/64" holes will need to be drilled and tapped (with the two self-threading screws are supplied with the kit) on the backside of the bearing plate, on the left side when facing the flywheel, to mount the GM HEI ignition control module. Be sure to apply the supplied dielectric grease between the module and bearing plate to dissipate the operating heat. 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.

• Connect the BLACK wire on the sensor to the [G] terminal on the module.
• Connect the BLUE wire on the sensor to the [W] terminal on the module and to engine/chassis ground (battery negative (–) post). NOTE: The [W] terminal on the module does not need to be connected to anything, but the blue wire on the proximity sensor must be grounded.
• 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.
• Connect the BROWN wire on the sensor to the [B] terminal on the module, and to the ignition coil positive (+) terminal and to the ignition switch (battery positive (+) post).
• Mounting holes in the module body must be grounded to engine/chassis ground (battery negative (–) post). When mounting the GM 4-pin HEI module, apply the supplied dielectric grease between the module and bearing plate to dissipate the operating heat while in operation.
• The cube-shaped proximity sensor has an LED (Light Emitting Diode) on the unit. If the proximity sensor is wired correctly, the LED will illuminate when in close proximity to the detectable target.