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Hi there:<p>I had posted a question early last month about a problem with my car--thanks George Dill for the advice!<p>I have another problem and this time I'm sure it is with the battery or alternator. I have taken the car into my mechanic (he's actually more of an Audi expert) and they have run various tests on both the battery and alternator because the battery gauge will go down when I'm sitting in traffic or at a light, only to go back up into the medium range when the car is moving. The mechanic swears everything is OK but I'm not convinced and I don't want ot be stuck on the road. <p>Last night I was driving home during a storm with the lights, wipers, etc. on and when i had to stop, the battery gauge went down dramatically and the car was slightly shaking. So basically the battery gauge moves when I'm stopped and goes back up when the car is moving. <p>Is there anything that my mechanic might be missing? Any help will be greatly appreciated!<p>Thanks!
 

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Re: 1990 Volvo 740 Turbo Intercooler Wagon--battery/alternator problems-HELP!!! (morgan06)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>morgan06</b> »</i></TD></TR><TR><TD CLASS="quote">... the battery gauge will go down when I'm sitting in traffic or at a light, only to go back up into the medium range when the car is moving. The mechanic swears everything is OK but I'm not convinced and I don't want ot be stuck on the road. </TD></TR></TABLE><p>As long as the mechanic has confirmed, by doing a proper load test on the charging system, the the charging system is OK, then what you describe is normal. Nevertheless, you should ensure that your engine's base idle is between 750 and 850 rpm, as the alternator develops current with revs. Too low an idle, and the alternator won't deliver any meaningful current.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>morgan06</b> »</i></TD></TR><TR><TD CLASS="quote">Last night I was driving home during a storm with the lights, wipers, etc. on and when i had to stop, the battery gauge went down dramatically and the car was slightly shaking. </TD></TR></TABLE><p>You have a problem with moisture in your wiring harness.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>morgan06</b> »</i></TD></TR><TR><TD CLASS="quote">Is there anything that my mechanic might be missing? </TD></TR></TABLE><p>Yes. Volvo experience and a complete set of fault tracing manuals for a 1990 740 Turbo. <p>Go to a Volvo specialist, ask whether they have a complete set of factory manuals for your car (ask them to show you), and pay the money needed to have your car serviced properly. <p>Don't fall into the trap: <A HREF="http://forums.swedespeed.com/zerothread?id=59524&postid=560130#560130" TARGET="_blank">http://forums.swedespeed.com/z...60130</A> <p>
 
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