Gm Hei 4 Pin Ignition Module Wiring Diagram

1986 gmc 350ci pickup had 5 pin ignition modules instead of 4 pin modules.

Gm hei 4 pin ignition module wiring diagram. Variety of gm hei distributor wiring schematic. A wiring diagram is a streamlined conventional pictorial depiction of an electrical circuit. Then even with a cd ignition in the car you can also keep that small aluminum hei module plate as a backup. In fact msd makes a slick wiring adapter to convert your distributor to the small two pin msd connector.

The diagram above is typical of the early hei using 4 pin ignition module and vacuum advance non est 1974 1980. Gm 4 pin hei electronic ignition control module wiring connections diagram with the cube shaped 3 wire inductive proximity sensor. He says the reason for the 5th pin is some high compression engines had trouble starting and when this pin is grounded through a vaccum switch retards the timing to help the engine turn over easier. If you have an amc a ford or a chrysler distributor with a magnetic pickup it s really easy to convert to a standard four pin gm hei module.

There s a 5 pin hei module specifically designed to listen to a knock sensor which would simply have to be mounted and its wire connected to the relevant hei module pin. Basic hei operation electronic spark control the ecm uses other electronic devices to help control the spark timing under various conditions such as under load deceleration etc. I read on another forum that some gm v8 vehicles e g. Each part should be set and connected with different parts in specific manner.

Most of the original gm v 6 and v 8 models used an ignition coil inside the distributor cap making it a one piece ready to run distributor. This ignition system operates with full 12 volts. We ve included a simplified wiring diagram to show. That way if the msd box fails it would only require a few simple wiring connections to hook up the hei module.

Hei ignition systems are very dependable and offer great performance on a number of applications. If not the arrangement will not function as it ought to be. 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.

If the ignition module any ignition module is starved for power it ll work unreliably and it ll die prematurely. This is a thoroughly tested researched and proven reliable ignition system invented by brian miller for ordinary lawn garden engines and competition pulling engines.