Question about 1998 Volkswagen Beetle

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Alternator or Voltage regulator

I have a 1974 vw beetle and need to know how to troubleshoot the ALTERNATOR and VOLTAGE REGULATOR to determine which one is the bad component that is preventing the charging system from working. With12.7 volts on the battery then start the engine the voltage starts going down instead of registering 13 to 14 volts as it should. How do I find the guilty party????????

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  • ekworthen Jul 26, 2008

    Thanks for rapid response. I have the battery voltage at the field but no magnetism at the pulley.

    Thanks again

    KEN

  • Anonymous Mar 31, 2014

    Alternator wont get above 13 volts

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If you can carefully put a metal wrench on the rotating pulley of the alternator and felt a magnetism attracting the metal wrench, then your alternator is charging. if there is no magnetism, then the alternator is not charging...

another test is to measure the voltage on the small wires that went in to the alternator that says "F" for field, it should measure battery voltage...that is the voltage from the regulator..that means your regulator is working...but the altrntor is not..

without that battery voltage, then the regulator is he culprit...



pls be carefull...

hope i was able to solve ur problem..

pls rate me.. tnx, drcool..

Posted on Jul 26, 2008

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