Strange electrical issues.. - Ford Powerstroke Diesel Forum
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Old 02-03-2013, 04:26 PM
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Strange electrical issues..

So I am hoping that someone can help me out here. I have had some weird problems with something in the electrical system. When I turn the key on, sometimes the dome light will get dim, and it cranks over really hard, sometimes not at all. Last night, when I turned on the key, it wouldn't even crank over. Then it started slowly turning over, then all of the sudden, like a switch flipped, dome light came on bright, and it cranked like normal and fired right up. It seems to come and go. I replaced the positive side cable (the only that links both batteries together and goes to the starter) and it worked great for a few days, then did the same thing again. Sometimes it will be fine for a few days, then will have this issue, and nothing changed, just was regularly driving it. Any one have any ideas? 2000 F250 7.3l. Auto trans, 4x4.
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Old 02-03-2013, 05:07 PM
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Re: Strange electrical issues..

On the passenger front of the motor there's a big stud for the ground make sure that's tight. Had a truck do similar things and the stud was loose. There's a nut and stud make sure you check both.

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Old 02-03-2013, 05:09 PM
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Great! I will take a look at that. That would make sense.. I also forgot to mention, that when it does this, the positive side of the battery terminals get quite hot, not sure if that would be from the same thing or not
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Old 02-03-2013, 05:24 PM
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issues

clean up all your battery terminals will help
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Old 02-03-2013, 05:30 PM
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Yeah, I did that when I replaced the cable
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Old 02-03-2013, 05:36 PM
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Re: Strange electrical issues..

Simple test put jumper cable from neg post on battery to alt bolt. If the bulbs get brighter ding ding!

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Old 02-03-2013, 05:37 PM
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we had the same issue. was in the ground cables on the batteries.
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Old 02-03-2013, 05:42 PM
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That's an easy test, just gotta find a jumper cable now
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Old 02-04-2013, 09:14 PM
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Little update.. Today it got really bad and this afternoon it wouldn't start at all. Luckily I was at my house already! I was able to work on it this evening, and I think I found the problem.. I believe there is a short or ground out in the cable from the alternator. I replaced this cable and it seems to work now. We'll see how it goes tomorrow, and if it keeps working. I think with this bad cable, my batteries also weren't charging all the time, and that contributed to the slow/no start sometimes.
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