About 30 second after starting my 1999 Jeep Wrangler, the check gauges light comes on and my battery gauge maxs out. It has been tested and it is overcharging. I replaced the alternator, the battery and the serpentine belt. That made no difference. I took it to a private mechanic who tested all the grounds, etc. for me, and they were fine. He could find no other explanation for the problem other than possibly replacing the computer, which would be quite expensive. Is there any way to be sure it is the computer before I spend that kind of money, or are there any other suggestions as to what the problem could be? Thank you. dodge ram 1500 bj2000, het zelfde probleem. al geruime tijd rijdend met lichten aan ging plotseling men voltmeter naar 18v. ben gestopt en heb men alternator even afgekoppelt waar men motor stil viel. na terug aan te sluiten en starten , werkte alles terug normaal. hopelijk heeft dit geen schadelijke gevolgen nagelaten. nu geruime tijd later, werkt alles nog prima.
The altinator is the only thing that can cause this battory cant put out that kind of voltage the altinator has a built in part on most called a regulator that drops it down some have an external regulater even the computer cant make it produce that kind of voltage the most likely problem would be alt or wiring to the alt can get bad ones from time to time
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