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My ignition relay fuse on my 1993 gmc topkick lopro 6000 keeps blowing after driving please help me

I have had several mechanics look at my truck and still havent found the problem. this is my business moving truck and i am out of business if i cant get this problem solved,please help if possible..

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Have any of the mechanics had access to or knowledge of the wiring diagram of the ignition circuit for this truck? Have they tried the wiggle testing to look for a short in the wiring harness? You said it keeps blowing after driving. Does it seem to blow the fuse as you are shutting it off? I would check the ignition switch in that case. Other than that, I would say further testing of the ignition circuit with a volt ohm meter is required.

Posted on Jan 15, 2013

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Posted on Jan 02, 2017

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SOURCE: 1990 gmc 6500 topkick with no spark or injector pulse

You are jumping to conclusions. Slow down.
No spark AND no injector pulse indicates none of the desired outputs were triggered. The ignition module makes spark when it receives a crankshaft position sensor signal, and then transfers control of that spark to the computer after it starts. The module takes its crank sensor signal and generates an RPM count that it forwards to the PCM(main computer) which is used for triggering the injectors and controlling timing. SO, if you had a bad crank sensor OR a bad ignition module, you could lose both spark AND fuel. a coil would not disable injector pulse. modules RARELY fail in a manner that disables RPM reference to the computer causing it to not fire the injectors...At this point, I would TEST the crank sensor as the next step. If its easier, 1 of the wires on the module goes directly there so you can test the crank sensor at the module.

Posted on Sep 18, 2009

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SOURCE: 98 stratus won't start

Sis had a 1997 Dodge Stratus and experienced issues with the cigarette lighter. Car would not start and I was able to trace an ignition fuse as the problem. Replaced the fuse and the car would attempt to crank but not start and the fuse would burn. Repaired the cigarette lighter and changed the ignition fuse but fuse continued to burnout. Pulled the accessory fuse and car attempted to start without the ignition fuse blowing. Put the accessory fuse back in place and the car started up no problem,

Posted on Nov 13, 2010

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