Hi Guys, I am having an issue with my HEI system.
I installed an HEI system in my truck a about two months ago. I started with a junk yard bracket and e-coil, and a new Oreilly's ignition module. The ignician module stoped working while I was adjusting timing and carb.

I replaced it with a better quality ignition module (still from Oreilly's) and was fine for 2 weeks. then, the truck stalled on me across the street from a mom and pop auto parts store in Mexico. I ended up replacing both ignition module and e-coil. This was two weeks ago, last night, the truck stalled again while my son was driving home from college.
So far,
3 ignition modules and 2 ignition coils.

please help.

30 amp. relay powers the HEI System.

I think I might have a short, but dont know were, or how to find it.

_________________
Slant power!!!
At least I try...

Is the HEI module mounted to a heat sink? Did you take the little nubs off the back of the module so that it sits flat on the heat sink? Is there heat sink paste between the module and heat sink?

Unless the coil failed to a shorted condition it's unlikely the coil killed the HEI module.

When I did my most recent HEI conversion I got a used, genuine GM HEI module and a GM coil I salvaged at a wrecking yard. It worked fine until I sold the car.

_________________
Joshua

yes to all the questions,, I made sure to follow all the instructions and precautions shared on this forum.

I too started with GM salvage yard coil, it lasted for about 1 month. I have to say that this car is not a daily driver, I might drive it 4 hours total before the HEI gives.

I check for power, there is power to the module. I am powering the relay straight from the alternator, could the power from the alternator be too much juice?

_________________
Slant power!!!
At least I try...

It may be that you have too much voltage at the alternator output. If there is a lot of resistance in the charging circuit the voltage regulator will increase the alternator output until the voltage regulator's set point is reached. Resistance can be on the positive side or on the ground side or both. You'll need to measure the voltage at various points to see that they are all similar. If they are not within a volt then there is high resistance.

_________________
Joshua

Thank you, that seems to be a bit out of my scope of knowledge and tools. Is there a safe for sure place I can use as a source for power?

You know,, now that I remember, this relay runs my HEI and my electronic fuel pump. could that be causing the failure? Could an overloaded relay cause the Ignition Module to fail?

_________________
Slant power!!!
At least I try...

It's not hard to make these checks so long as you have a good volt meter and understand the principles at work. The analogy to electricity in a wire is water in a pipe. Voltage is electrical pressure. Resistance is a restriction in the pipe. So if you have a restricted pipe (high resistance path) between the alternator and the voltage regulator the voltage regulator will increase the voltage/pressure so that the voltage regulator is satisfied. That will make the pressure/voltage high at the alternator output.

_________________
Joshua