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Old 12-30-2009, 10:19 PM   #1 (permalink)
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40 amp ignition fuse keeps blowing when key on

i keep blowing the 40 amp ignition fuse.. i have no idea why but when i put a new one in, pop it blows.. any help??
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Old 12-30-2009, 10:24 PM   #2 (permalink)
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i tried jumping the wires on the starter and the starter cranks, could it still be a bad starter?

i have no idea where to go with this
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Old 12-31-2009, 09:30 AM   #3 (permalink)
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i just disconnected the big starter wire from the starter, i jumped the terminals for the fuse with a jumper wire cause i only have 2 fuses left, (i burnt 9 of them), and it started melting the jumper wire.... so i am assuming since there is no power to the starter, as in power wire disconnected, that it is not the starter
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Last edited by XECCLLC; 12-31-2009 at 09:44 AM. Reason: word edit
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Old 12-31-2009, 10:00 AM   #4 (permalink)
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ok now i disconnected the small wire to the starter and the big wire.. jumped the ignition fuse again, key on and started melting the jumper wire again..

its definitely not the starter...
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Old 12-31-2009, 10:01 AM   #5 (permalink)
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there are 2 igntion fuses in the box, the top one says ignition run, the bottom one says ignition run acc.. the one that is blowing is the ignition run which im assuming is the starter fuse cause i dont see one labeled starter
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Old 12-31-2009, 10:14 AM   #6 (permalink)
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Mine started popping fuses a month or so ago when I would go to start it. I cleaned the grounds at the battery and it hasn't popped any since. Clean all of your grounds even at the block and if it still does it I would say it is likely in the starter.
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Old 12-31-2009, 10:18 AM   #7 (permalink)
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Oh, man. Electrical issues are always a pain in the @$$. I would try getting a multimeter and check both sides of the fuse holder to ground. Hopefully, you won't have to go all the way up into the ignition switch to find the problem. I'm definitely no expert when it comes to these sorts of things, but that is where I would start. You've obviously got a short somewhere. Might as well not burn up your last two fuses. If you don't have a multimeter, even a cheapo would work just fine for troubleshooting this. You're only looking for continuity. Keep us posted!
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Old 12-31-2009, 10:50 AM   #8 (permalink)
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ok here is what i got now, starter wires are disconnected, i used my meter to check for continuity from the "hot side" of fuse to ground.. no cont.... i checked the "hot side" to pos on battery.. cont... so all good so far..

now i checked the "cold side" of fuse to ground, nothing, i checked it to positive on battery, nothing.. i turned THE KEY ON... now i have continuity from the "cold side" to the neg on battery and also the posi on battery...

so now im puzzled and confused cause i dont know what gets powered up with this circuit with key on

again it is the ignition run fuse 40 amp

NOT THE IGNITION RUN ACC FUSE
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Old 12-31-2009, 10:59 AM   #9 (permalink)
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You definitly have a short somewhere. It has to be something that is drawing a lot of current to blow a 40a fuse. First off, I would check any electrical devices that could draw this much current, i.e., starter, starter solenoid, and fuel-shutoff solenoid come to mind. So you removed the red 12v power cable going to the starter, which is coming straight from your battery, and the fuse still blew, correct? Also, disconnect both this cable and leads going to the starter solenoid at the same time, and try again. I know when the starter shorts, it can also fry the fuel-shutoff solenoid. I would also try disconnecting the fuel-shutoff solenoid, which draws a lot of current, and then try again, it is possible the fuel-shutoff solenoid could be shorted and is sending current back thru to your ignition circuit.
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Old 12-31-2009, 11:19 AM   #10 (permalink)
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Where Is The Fuel Shut Off Solenoid?
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Old 12-31-2009, 11:43 AM   #11 (permalink)
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Right next to the AFC housing, which is just behind the delivery valves. It's a cylindrical looking thing that has a rubber boot extending down.

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Old 12-31-2009, 02:27 PM   #12 (permalink)
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So I Was Able To Get The Truck Started.. I Dont Know What I Did But It Fired Up.. But I Shut It Off And Now Its Doing The Same Thing!!!! Uuhhhggg Wat In The Heck Is Wrong With This Thing
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