Question about 2001 Volkswagen Passat

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I replaced the battery in my 01 volkswagon passat, it ran for a while then the engine slowly die, instrumental lights dim and the car cut off. It started again after a jukp but, continued the same process. is it the alternator or voltage regulator that bad

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Does the battery light come on when you turn the key if not it could be in the instrument cluster I had to replace mine in a 1992 Passat it was doing the same thing

Posted on Jan 18, 2015

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You can test the alternator your self, get a multimeter and check the voltage of the battery (black -, red +). Usually car battery rest voltage is 12.3-12.5 V. Once you start your car the voltage should rise immediately to 13.8-14.7 V depending what your alternator puts out. If the voltage does not change after you start your car the alternator is broken.

Posted on Jan 28, 2015

  • trsrhddn Jan 28, 2015

    alternator is good it is in the dash cluster I can jiggle things under dash and it starts charging again

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The alternator is shot, The car will run on a new battery for about 20 mins, then it fizzles out. The alternator contains the regulator, You can take it and get it checked, but I'm sure that is the problem, get your battery charged up while you do the alternator,and keep an eye on the charge light. Make sure it is charging, just because it is new doesn't mean it is good. Hope this helps.

Posted on Oct 07, 2010

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