In 1991 for the 1992 model year, Isuzu completely redesigned the Trooper to keep pace with changes in the SUV marketplace, making it larger, more powerful, and more luxurious.

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Battery charging issue, no blower

2000 Isuzu Trooper, heating/cooling blower on dashboard not working, battery light is on, battery won't charge.... but, got it to all work couple times by disconnecting battery cables, hooking them back up, battery sometimes charges, light goes out, blower works, but problem recurs again. Suspecting ECM or charging relay if I could find it. Any advice is appreciated, thanks!

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will the truck start and run ok and do the lights work ok ?

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Yes, so far it starts and the lights and everything else works. Thanks for responding.

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I ran the car with headlights on, battery slowly drained. When it got below 11 vdc car wouldn't start. It's not charging. Can anyone tell me where the charge relay is located? Can't find it, and there's no Haynes or Chiltons book for this model. Thanks.

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Haven't yet removed the alternator, been looking at this thread, lot of helpful info on it, some guys tried more than one alternator and still had the same issues, scroll down and check out what "mwolfe" says on a long post, he thinks it's the answer - if it's not the alternator. Another guy said yes to this method also.

https://forums.edmunds.com/discussion/86...

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Black Friday
Broken doesn't stand a chance.

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Matt thanks for the help, and in the future I might need what you said here. Actually I just got my rig running right today and here's how. After taking the alternator to O'Reilleys and having it check out "good", I put it back in the rig and still had the problem. So I tried something, I started the car then pulled a battery cable, the car shut off. If the alternator had been good, the car should've kept running on alternator power alone, but it didn't. So I took the alternator out again, ordered a new voltage regulator off Ebay for $25, opened up the alternator, replaced the regulator - no more problem!

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I have had previous GM / Chrysler vehicles develop battery charging issues and both times the alternator failed. Worse case scenario, check if the protection diodes on the back of your alternator are broken. Sometimes they will be have black marks on them or have a tiny hole in them. These protection diodes can fail from an overcurrent situation such as improperly using your vehicle to bump start a friends, or charging your car battery + using a battery charger to get your engine running. If these diodes are dead, replace them or the alternator. Depending on your alternator, you may be able to find the rear housing with the protection diodes for sale at a parts store. If you just want to replace the diodes you may have luck on digikey or mouser finding replacement diodes.

There is a chance your alternator is fine. I just thought I would mention this if it helps you troubleshoot.

Good luck!

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@lawrence93 Test the alternator This is an excellent video . This video shows removal Hope this helps.

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That post that you've said you've been reading my "mwolfe" on https://forums.edmunds.com/discussion/86... is the same discussion and post that I found when I ran into the same problem on my 98 Isuzu Trooper. I ran out of other options and replaced literally everything involved in charging the battery before finally finding a wiring diagram and cutting that wire. It worked. It fixed the charging issues in my Isuzu. Since you have a 2000 Trooper, it'll probably be the same wiring diagram that I found (I used one for a 99 Trooper).

There is a picture of the wiring diagram posted about halfway down on https://www.justanswer.com/car/7ophv-isu...

If you go that route, then the wire you'd want to cut is the one that goes directly from the alternator to the ECM/PCM. In the 98 and 99 Isuzu Trooper it's white with blue stripes. It plugs into the back of the alternator, then clips into the same color wire somewhere near the fuse box before going to the PCM. Cutting it anywhere should do the trick. I'm not a mechanic and have limited mechanical skill. All I know is that it fixed my charging problems.

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Another thing I forgot to add was that on inspection of the old voltage regulator plug, I saw it had a huge buildup of hard crusty material on the contacts. I wondered if it hadn't caused some of the problem, and if I had seen it earlier I would've cleaned it and the plug it goes into and tried it, but I had already replaced the regulator and it worked good.

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Lawrence Hart will be eternally grateful.
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