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Showing results for tags 'voltage regulator blues ?'.
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I have written a few times about this annoying, on going problem with my 2002, 911 996 . It started months ago, when I would get a weak , or dead battery , after driving for a while. So I got a brand new high cranking amps battery, the alternator was removed and bench tested at a shop specializing in them, I wire brushed , and checked all wiring connections ( as several guys advised ) all ok. So I thought I was out of the woods , NOT ! Again after installing the new battery, and taking it out for a drive, all was fine on initial start up, and whilst I was driving along for about the first 5 or 6 miles, then the voltage guage, I had plugged into the cigarette lighter, once again started going down. First it hovered around 13.4 or 13.5 volts, then it started dropping to about 12.9 then about 12.5 Red light, not good. The conclusion is, once the motor warms up , and has been driven for about 7 or 8 miles this happens. I leave it overnight, start it up the next day, and once again, high voltage, and everything is fine. That is until it's driven for a while. Many folks on here kept telling me about the ground straps, and battery wiring, in particular the one that attaches behind the right rear wheel, by the wheel well ( Why they would put it there, where it's vulnerable to corrosion, and everything the wheel kicks up is anyones guess ? ) This only happens after a good run ,and warm up, and a faulty, or corroded connection, would not be affected like that would it ? I assume that would be like that at all times , if it was a resistance/corrosion problem, even on initial start up ? Therefore ,I'm thinking it could be a faulty voltage regulator, thats being somehow affected by the hot motor, after it heats up after 6 or 7 miles ? Any thoughts on this , this mystery is driving me nuts, I almost want to trade it in for a BMW, it's so bad. Any thoughts or advice ? HELP !!!! :help: