Alternator/Battery charginf problems
03-18-2006, 09:36 AM
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Alternator/Battery charginf problems
Hello all.
Long time lurker here, but today I finally took the time to register. I own an 87 toyota pickup on 35/14.50/15 gumbo monster mudders. When I break something I am usually good about fixing it, but the following problem just has me stumped.
About a week ago I noticed my battery going completely dead. I had the alternator tested and it registered bad, and since the battery was really old I went ahead and replaced it as well. Drove it around about a week during the daytime, and the truck was holding it's own. After a night of driving, I noticed my headlights getting more and more dim until the truck finally died. The next day I charged the battery up, started the truck and let it run for about 5-6 minutes, then took the negative side off the attery and the truck promplty died.. alternator wasn't charging. Took it off, and has it tested thinking I may have gotten a defective one, but it registered out perfect.
That's where I am at right now. I am stuck on what to do. I have checked the wires as best I can, and they all seem to be fine. Is there a fuse or something somewhere that I am missing? Any info at all would be greatly appreciated.
Rob
Long time lurker here, but today I finally took the time to register. I own an 87 toyota pickup on 35/14.50/15 gumbo monster mudders. When I break something I am usually good about fixing it, but the following problem just has me stumped.
About a week ago I noticed my battery going completely dead. I had the alternator tested and it registered bad, and since the battery was really old I went ahead and replaced it as well. Drove it around about a week during the daytime, and the truck was holding it's own. After a night of driving, I noticed my headlights getting more and more dim until the truck finally died. The next day I charged the battery up, started the truck and let it run for about 5-6 minutes, then took the negative side off the attery and the truck promplty died.. alternator wasn't charging. Took it off, and has it tested thinking I may have gotten a defective one, but it registered out perfect.
That's where I am at right now. I am stuck on what to do. I have checked the wires as best I can, and they all seem to be fine. Is there a fuse or something somewhere that I am missing? Any info at all would be greatly appreciated.
Rob
03-18-2006, 09:58 AM
#2
check the fuse box next to the battery and there should also be a "fusible link" somewhere along the main output charge wire on the alt.
With a voltmeter and the truck idling measure the voltage at the battery.....since yours is not charing there I expect you will measure 12.4 volts.
With it still idling measure the actual output of the alternator. I think it's a thick white wire on the back. If it measures 14.2 then the alt is good and you likely have a break in that wire somewhere....if you measure only 12.4 or so then the alt is either bad or the harness that attaches to it has an issue.
With a voltmeter and the truck idling measure the voltage at the battery.....since yours is not charing there I expect you will measure 12.4 volts.
With it still idling measure the actual output of the alternator. I think it's a thick white wire on the back. If it measures 14.2 then the alt is good and you likely have a break in that wire somewhere....if you measure only 12.4 or so then the alt is either bad or the harness that attaches to it has an issue.
03-18-2006, 10:07 AM
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In the older rigs, grounding commonly becomes a problem. Do a search on here for some of the remedies and I am betting you find an answer to your problem.
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