All new parts and still burning ign modules.. what else to check

[NASTY-LSX]

New cap new coil new rotor new module (AGAIN) Brand new Alt.

After all this new stuff the truck will stay running for 5/10 seconds then just burn the module..

So I borrowed one of my friends good hei dizzy and installed it. 5 seconds later it burned up..

I have read and read and found nothing to remedy this cancer.. What are my other options before burning my truck down?? Thanks.

Yes im using the dielectric grease.

1985 K20 4x4 5.7

[wildwilly4x4]

make sure you have a GOOD ground to the dizzy

[Jake Wade]

Just a hunch but, maybe a bad pickup coil?

[undertaker72]

Are you putting the dielectric compound underneath the module when you mine it to the distributor

[RootBeerFXS]

Since you tried a new distributor and it happened to it too, I would start with the trucks wiring to the dist. Is it the original power source for the dist? Make sure your engine is grounded to the frame properly. Did it just start happening all of the sudden or what did you fix, replace or mod before it happened?

[D13]

My repeat ignition module fails were grounds or feedback from a bad plug wire (will never buy ACCEL again).

[homemade87]

Blowing them that quick may be a over voltage problem from the alt . If you get above 14.5 it can wipe out aftermarket modules quickly . Also aftermarket ( part store ) modules usually do not have over voltage protection like the GM ones have . Once you get it figured out I would suggest getting a GM module .

Might want to take alt somewhere to get it checked out . Preferably some where where they repair them if possible and tell them your problem so they will look at the voltage closely . With you problem happening so quick I would rule it out first .

Just a note . The compound that goes under the module is not a dialectric grease . By using this it will most likely insulate the module and not let the heat transfer . There is a white compound that is special made for this . I would also track some of it down when you install a new module . In other works do not use dielectric grease It does not do the same thing.

[jjzepplin]

I was thinking the same thing when I saw this. Maybe take the alternator down to a parts store and have the voltage checked. This way your truck does not have to run to check it.

[NASTY-LSX]

Anyone?

[MountainGoat1966]

I agree with getting the alternator checked for output voltage and making sure the engine/frame/battery grounds are all clean and tight. If you are in doubt you have enough grounds, it won't hurt a thing to run a couple more. In fact, it could help some issues.
As was posted, don't use dielectric grease.
Go to Radio Shack and get a tube of white heat sink compound.
About 5 bucks for a small tube, but well worth it and it's the only type of compound you want to use on the module.
Clean off the old grease, and liberally apply the heat sink compound. Make sure it is covering the entire mating surface.
I can't think of anything else that can cause the modules to burn up like that, overvoltage and heat are the enemies to avoid.
Keep us posted how you make out and if you discover anything weird along the way that causes issues.

[ron350]

What he said.

Originally Posted by RootBeerFXS

Since you tried a new distributor and it happened to it too, I would start with the trucks wiring to the dist. Is it the original power source for the dist? Make sure your engine is grounded to the frame properly. Did it just start happening all of the sudden or what did you fix, replace or mod before it happened?

[gmachinz]

Take a 12ga wire and ground it to the distributor base and engine.

[hatzie]

Set your meter on AC Volts and check the battery voltage with the engine running. A bad alternator diode will dump AC into the system and the module won't like that.

NO AC? set the meter on DC volts and check that you have no more than 14.5V DC and the voltage is steady when you throttle up.

Are the new parts cheap Chinese electronics or AC Delco Professional grade parts?
Chinese Ignition coils, Pickup coils, Reluctors, and Ignition modules are complete garbage. You'll continue to have failures till you put in decent components. Maybe not this extreme but they are not long life components.

Cheap Chinese ignition coils and pickup parts will kill Delco ignition modules pretty quick too... so don't just put in a Delco module and assume the problem will go away.