Question about 1985 Nissan 300ZX

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The alternator keep charging when it not suppose to

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Hello
check the regulator on the back of the alternator that may be faulty
enjoy

Posted on May 25, 2011

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Speedometer, temp gauge,battery indicator and rpm gauge not working. I checked the fuses and the wiring to the alternator but still dont know what the problem is and when i disconnected the groung to the...


depending on how new your truck is you may not be able to disconect the battery and keep it running there are just so many electrical things in cars now adays that the altnator alone just cant keep up with every thing at idle you may want to go to a local scrap yard and get a whole dash cluster or check all your fuses again first

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when you start the car you need to see if the alternator charge its supposed to 13,7 to 14.5 max it supposed to stay like that but the way our taking its probably charge ok when its cold and when the car get warm the charging goes down in the back of alternator our supposed to have the same voltage as the battery if not check the big wire in the back for corrosion if our not sure the wondition insted of opening the wire harness bring direct power from the positive side of battery to the big wire in the back of alternator and from the negative side connect to the metal of alternator after that if its still get to hot change the alternator if you think my solution is intelligent please rate it thats the way i would check our caqr in my shop thanks pierre

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Are the connections really dirty at the voltage regulator? These tend to get corrosion on them and cause weird charging system issues. Also make sure the ground is good on the regulator.

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