Question about 2001 Ford F250 Super Duty Super Cab
My battery light came on. I took it to the dealer they said it was a blown fuse. It happened a little while later so I just went and replaced the alternator (even though mine tested good) and both batteries. The fuses kept blowing and I would just replace them. All would be fine for a month then the light would come back on well now the fuse blows every time I replace it instantly I looked up some forums and they said it's the plug into the alternator that is the problem. Replaced that and still is on. Help please!!
First of all the first time they replaced the fuse they should have found out WHY it blew in the first place. They dropped the ball on you . Sorry you had to blow so much cash and having such a hard time.. First thing I want you to do is , and it will sound dumb but just humor me, sit down and try to think about every time it blew. What was going on , what were you doing at that EXACT moment, was it sunny or raining. What EXACT fuse is it and where is it located? What we are looking for is a common factor. How much time between them blowing a little while later to you may be two weeks where to me it would be an hour or so. See here is how we find out, we become detectives that's why most guys will never make it as a good mechanics and they will always be parts changers, figure out WHY did it fail and try to fix the problem not the result. When you stat the vehicle did the starter drag some? If it is an alternator related area problem a common thing to happen is for the wires to rub against something or lay against hot exhaust exposing the bare wires to the metal of the engine/frame. This could cause it to short and blow the fuse at different times. Say you went across Railroad crossings and pow it blew. The vibration shook the wires and they made contact shorted and blew the fuse, Rained a lot you went through some deep water and it splashed up made the connection .....blown fuse. Same thing with the battery hot wires you mentioned you had batteries changed. Think about it a MONTH later the fuse blew. I would start looking from the batteries on following the hot wires to see if somewhere they were touching something or loose. See there just sitting here running my mouth and we have a place to start. Batteries hot wires tracing them. You said batteries, so you will have to have a regulating device between the two to allow for equal charging, check all the connection and feel to see if the box or any of the wires seem hotter than anything else. Fuses blow because of the amount of electromotive force (AMPS are greater than the fuse can handle so they get hot and burn into. When they put the new batteries in maybe they moved the hot wire in a position that was further from the point it was grounding to but now because of a months worth of vibration they have slid right up next to the ground and ZAP . Hope you found something in what I mentioned just don't give up . Let me know what you find. Also check the owners manual to be sure the correct size fuse is in there to begin with. Good Luck
Posted on Mar 23, 2014
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Posted on Jan 02, 2017
Hi, I can't tell you exactly what is wrong because there is too much involved at this point, what with 2 shops working with it, but I can give you some advise on what else to check. On the alternators and the wiring that supports them a small volt charge is taken off one of the slip rings, where the brushes ride, for the purpose of turning out the light. As I remember, this is a yellow wire that runs back to the dash.
To the alternator, it would be one of the wires that plug into the side of the alternator case.
Posted on Nov 27, 2008
My 2002 F350 keeps blowing fuse 45. I lose the instrument cluster (all gauges) and there is no throttle response. Sounds like a wire for the od button is shorting out in the steering column. Remove the ignition switch and column shroud and look for a bare wire. be sure and look by where the boot sits. I am just looking for more info before I try it myself. Hope this works for others.
Posted on Jun 05, 2009
you will need to do a test with a battery light disconnect the negative wire on the battery and connect one end of the test light to the battery and the other to the terminal with everything switched off if the test light is lit you have a draw if it is not lit then it is something else sometimes door switches and glove box switches wear out and need added lift to properly shut the open circuit down
Posted on Aug 26, 2009
I found the problem YEAH. It was the fuse that is in the side of the fuse box under the hood, Its where the battery wire from the alternator connects thru a fuse to go to the battery, Its one hundred and something volt fuse. It took care of the problem instantly.... Thank you all for your replies...
Posted on Sep 02, 2009
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