1990 Chevy K2500 Ignition Module Fails

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RACER86
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  • 1 POST
I have a 1990 k2500 4spd. The module keeps going bad sometimes it last 6 months sometimes 2 days.I am putting dielectic grease on the bottom of the module.And made sure the body and engine had good grounds. THANKS
Jul 12, 2006 at 1:33 AM
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VANDRAGON
  • ✓Experienced Mechanic
  • 298 POSTS
it sounds like your getting too many volts to it. is there anything else weird it does? i had a 79 buick that had a bad connection at the starter from the positive side of the battery. the power windows slammed up and down and the wipers went light speed. i replaced lots of coils and moduals. the corrosion at the starter was backing up the voltage. replaced the cable and it stoped. anyway i still think it's getting too many volts. good luck
Jul 12, 2006 at 1:38 PM
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MIKEYBDMAN
  • ✓Experienced Mechanic
  • 623 POSTS
I agree, it sounds like you may not have clean power on your vehicle. I would start at the battery cables and check for connections and corrosion and work my way up to the altenator. Test the altenator and see what kind of voltage it is putting out. If it is putting out live more than 14 volts, your regulator my be bad on the over voltage side. 1990 you probably have the regulator inside the altenator, but check the output voltage and make sure iut is not too high.
Check all of the wiring on your ignition system and make sure you dont have any loose of corroded connections. If you have too much resistance, then it just draws more power to make the ignition run, and can be burning out your packs.
Dont let any ground go unchecked. If you have to take the ground stud loose, and clean and sand all the connections to make sure they are grounding perfectly, then do it to all of them.
Your problem is a pain, and will be a pain to fix, so just start at one side and work your way to the other and wring out every wire.
Jul 13, 2006 at 8:21 AM

Suggested Repair

Check for overvoltage and poor connections. Inspect and clean battery cables, the starter positive connection, and all grounds. Test alternator output; if it exceeds about 14 volts, the internal regulator may be bad. Also inspect ignition wiring for loose, corroded, or high-resistance connections.

Conversation Summary

The owner of a 1990 Chevrolet K2500 says the ignition module fails repeatedly, sometimes in days and sometimes after months, despite dielectric grease and verified body and engine grounds. Experts suspect excess voltage or dirty power. They recommend checking battery cables and starter connections for corrosion, testing alternator output for overvoltage, cleaning all grounds, and inspecting ignition wiring for loose or high-resistance connections.

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