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1996 isuzu can't get battery to charge

9 messages,  Last post on Jul 08, 2009 at 9:57 PM

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#8 of 9 Alternator Issues by mwolfe Jul 02, 2008 (9:36 am)
I was driving along happy in my 97 Rodeo, when all of the sudden, my A/C and fan motor went dead, and my brake, battery, and 4WD indicator lights came on. I checked fuses, and immediately suspected an alternator issue, and got a replacement from Advance. I replaced the unit, but no change. I checked fuses again, and switched relays around, nothing worked. When I took the core back, I had them test it, and they said it was only putting out 10 volts. I took the new one in and had it tested, and it was OK. I took it to the dealer, and they said that the aftermarket alternators aren't any good. I new OEM was around $500. I went to NAPA, and picked up another and put it in, again nothing. I noticed that unplugging one of the harnesses to the alternator enabled my A/C to run. Further playing around, I found that there is a Red wire with a white stripe that leaves one of the two alternator harness connectors by the engine fuse box. Once I disconnected that wire from the harness connector ( it comes apart ) my alternator is charging, and everything is back to normal. This wire connects the alternator to the computer, and I believe serves some enabling function. When I connect even my digital volt meter to the alternator on that pin, it cuts the alternator output. When they tested the alternator at the store, they basically hook up 3 wires: ground, 12 in, 12 out. The wiring harnesses provide like 5 paths plus the chasis ground. I will eventually get the OEM alternator replaced to verify, But in a pinch, I hope this helps. I just think there's an Isuzu specific circuit that isn't verified by the re-manufacturers, and that's why 95% of these don't work. On the plus side, I've had the alternator out so many times I can replace it in about 15 minutes while the engine is still hot
#9 of 9 new battery and alternator still wont charge by orlando11lugo Jul 08, 2009 (9:57 pm)
The problem is all the same as everybody else.Its not the regulator that is inside the alternator.The problem is the Harmonic Balancer went bad so its slipping so the belt turns slower than normal given you all this problem.Hope this helps .

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