GM 4 Pin HEI “Semi Points” Conversion

[Offroad MudMowers]

The General Motors HEI Module (High Energy Ignition) is a very “Powerful” part. The HEI is great “converting” a points engine into a “semi points” engine. I call it converting, but truthfully the points still remain in use. The points normally charge the ignition coil(s), drawing an amp or so through the points. Having a few amps pass through the points a few hundred times a minute has a pretty big toll on the points longevity. Adding a HEI into the ignition takes on the points’ job by charging the ignition coil(s) versus the points having to charge the ignition coil(s), and now the points send a “signal” to the HEI, and the HEI will amplify that signal.

 

Tips:

• It is important to keep the HEI cool. Mounting the HEI to aluminum works great to transmit heat.
• Double check your wiring after installing the HEI! Nobody wants to burn up their work or damage the points or HEI due to a simple mistake!

 

Troubleshooting: 

Just installed the HEI and you are getting no start/spark?

Try checking that 12 volts is going to the B Pin on the HEI module. If not, jump 12 volts to the B Pin to eliminate any wiring issues.

12 Volts is being fed to the HEI, but still no spark is produced at the ignition coil(s)?

Try jumping G Pin directly to a ground, maybe even the negative post of the battery. Often the case will be a bad ground.

Here is an installation of a GM HEI on a Cushman Truckster equipped with a 22hp OMC engine. Wow did it make a difference! 

Oh would ya look at that! Another Cushman Truckster with an HEI ignition upgrade!

• This topic was modified 3 years, 2 months ago by Offroad MudMowers.
• This topic was modified 3 years, 2 months ago by Offroad MudMowers.

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