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Old February 26th, 2008, 04:40 PM   #1
foxracingtrx250x
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For starters I have a 1991 5.8L I have had a drain in it I checked the codes nothing came up but an exhaust smog thing. So I then replaced the alt and the battery they both needed to be replaced. I also replaced the fuel pump relay and it still drains. It will drain fully within about 6-8 hours so what could be making my truck drain so fast????????? Also forgot to mention that when the trucks on the tail lights stay on without me having the lights on but im guessing thats just a bad ground.
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Old February 26th, 2008, 04:44 PM   #2
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my dad has a 91 with the 4.9 does the same thing but tail lights arn;t on ....... Your tail light problem is problem a bad brake light switch on the top of the brake pedal fords like to go bad, my 97 f150 just got replaced the other day actually
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Old February 26th, 2008, 04:45 PM   #3
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not sure exactly why our 91 does it either we just put a power shut off on it to kill all battery power
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Old February 26th, 2008, 04:53 PM   #4
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Take of the neg cable from the battery and put a test light between the cable and battery terminal. It should light up if there is a drain ( with the key of). Now start pulling out the fuses one at a time and see when the light goes out. That should at least get you in the direction of what circuit is fck'd up. When pulling the fuses one at a time be sure to put the fuse back in before going to the next circuit if the light did not go out.
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Old February 26th, 2008, 05:15 PM   #5
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Quote:
Originally Posted by Icebreaker88 View Post
Take of the neg cable from the battery and put a test light between the cable and battery terminal. It should light up if there is a drain ( with the key of). Now start pulling out the fuses one at a time and see when the light goes out. That should at least get you in the direction of what circuit is fck'd up. When pulling the fuses one at a time be sure to put the fuse back in before going to the next circuit if the light did not go out.
Thanks Ill do that right now
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Old February 26th, 2008, 08:12 PM   #6
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yep, thats the way to diagnose it.....this could be a five minute fix, but it could also be a 5 day fix - tracing wires can get very very tedious
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