Question about 1986 Chevrolet K1500

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Blowing a 40 amp ignition fuse everytime I turn the key over. Suspect short in starter

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  • Anonymous Aug 31, 2008

    I am having the same problem with my 2004 Surburban. I changed the starter and it blows the fuse everytime i try to start. I cheked the old starter and it was good so I put it back on. Every time I go to start it, the ignition fuse blows. Any suggestions?????

  • coolnbrook Sep 15, 2008

    i have a 2000 with a V6 thats doin the same.

  • brianblair23 Sep 18, 2008

    I have the same problem, everytime I start the car in my 2003 cavalier, the 40 amp fuse blows killing my ignition, my signal lights and my brake lights.



    HELP!!!

  • Dan Dubay May 11, 2010

    What year is the vehicle and engine size?

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It is a grounding problem.Your motor does not have a good ground from the motor to the frame..Bad starter will not blow a fuse. Clean all of the grounding straps especially the big ground wire from the battery to the motor. Bet if you check that little ground from the battery to the frame it will be melted..because the main ground to the engine is bad..

Posted on Sep 24, 2008

1995, 350

Posted on Jul 27, 2008

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40 amp ignition fuse keeps blowing on my 1998 Chevy ST 2WD


You have a short to ground on that circuit , find a wiring diagram an see what all is on that fuse . So far I see the ignition switch an starter relay ! Does it blow right away when you replace it or do you have to turn on the ignition switch ?

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My biggest concern would be: What caused the fuse to blow in the first place?

If you get nothing else from my preaching, get this:

Fuses don't blow for no reason....ESPECIALLY not a 40-amp Maxi Fuse!

I can't count how many times I have heard people say: "It's JUST a blown fuse." WHAT???

I have been at this for 35 years and I can tell you that blown fuses are reason for major concern in my book. That 40-Amp Maxi Fuse just saved your truck from burning to the ground and you need to find out why!

The only way that fuse is going to blow is if there is a direct short to ground between the Underhood Fuse and Relay Center and the Instrument Panel Fuse Block (The only "component" between these two is the ignition switch.) or if the secondary side of the starter relay circuit is shorted to ground. The secondary side of the starter relay feeds the "S" terminal of the starter solenoid. (at the starter)

I think the first place I would look for the problem would be the circuit between the starter relay and the starter. It is likely to be shorted against the exhaust or engine block. If this is the case, it most likely fried the starter relay in the process. (which is why the fuse no longer blows and the engine no longer starts)

Aftermarket remote starting units are also usually tied into this circuit. If your vehicle has one of these, it could very likely be the original source of your problem.

At any rate, there should be no rest, truck running or not, until the reason for the blown fuse is found. You will most likely get the truck running in the process of locating the reason for the blown fuse.

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Don't replace the fuse.Their expensive and will keep blowing.

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