Hello. My $1 bets that it's a chafed or loose wire making intermittent contact with something it should, like ground for instance. Were it my car, I'd drive around with any fuses I could get away with removed one at a time, to try to find out which circuit it's in, starting with the one you're having trouble with. Neato problem. It sounds dreadful. Good luck. Rick. --- In dmcnews@xxxxxxxxxxxxxxx, "John Poland" <jpoland13@...> wrote: > > I'm having a problem with my charging system and can't figure out what > it is. Sitting still the car charges fine -- 13.5-14 volts at any > RPM. As soon as the car starts moving the charging system starts to > jump around anywhere fromm 13.5 - 8 volts. As far as I can tell the > belt is not slipping (at least not when the car is still at anywhere > from idle to 5000 RPM), the alternator and voltage regulator have been > tested and are fine. Ground straps have been checked and cleaned. It > is not the gauge, lights dim when voltage goes down. The only other > thing that appears to be wrong is the fan fail. It comes on when > needed but doesn't turn back off until the car is turned off. > Related??? > > The alternator is a 105 amp GM and has been working great for months > (until after the problem with the fan fail started). > > Please HELP!!!!! > John Poland > 05935 > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/