I give up and need help
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Joined: Jul 2005
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I give up and need help
I just rebuilt a 351 for my 79 f-150. I was tightening the alternator when my dad shows up. I go inside for a beer and when i come out he is messing with the wires by the starter relay. now when I shut down the beast if I dont take the battery cables off, by morning the battery is dead. Idont know what he did but i sure could use some help.
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Joined: Jan 2001
Posts: 56,984
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From: Virginia
Try the trick below with a testlight.
If it glows brightly, then take the smaller wires off the starter relay + post that go to the battery. The light should go out. Touch each wire individually till you find the one that makes the testlight come on. If it happens to be one that goes up into the cab, then you might have a dome light problem or something else, and you can pull fuses till the light goes out.
If one of the wires that makes the testlight light goes to the alternator, then you might have a problem with it. If it has a shorted diode, that can cause a drain.
If it glows brightly, then take the smaller wires off the starter relay + post that go to the battery. The light should go out. Touch each wire individually till you find the one that makes the testlight come on. If it happens to be one that goes up into the cab, then you might have a dome light problem or something else, and you can pull fuses till the light goes out.
If one of the wires that makes the testlight light goes to the alternator, then you might have a problem with it. If it has a shorted diode, that can cause a drain.
