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What goes out on alternators?

This is a discussion on What goes out on alternators? within the General Help forums, part of the LSx Technical Help Section category; My alternator is starting to give out imo.I have 13.8 volts at idle,but drops below that on my instrument cluster ...

  1. #1
    Junior Member
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    01 Formula

    What goes out on alternators?

    My alternator is starting to give out imo.I have 13.8 volts at idle,but drops below that on my instrument cluster when I turn the ac on.Its not the battery.So what
    starts going out,rectifier,regulator or ?.Im thinking of rebuliding one.

  2. #2
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    I always assumed it was the brushes kinda like electrical motors, but not really sure.

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    That guy thearborbarber's Avatar
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    1991 Suburban

    The rectifier diodes as well.

  4. #4
    Member edbird's Avatar
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    1999 trans am convert

    Voltage regulator which ,I believe,has been built into altenators for many years now.After car runs for 5-7 minutes,you should read 13-16 volts at battery terminals.If you turn on stuff and it falls below that, my guess is alt.BUT, I would have it checked first before buying new.Autozone and the others do this for free.If you have added a lot of extra electrical stuff to your car you may exeed output of altenator also.
    Also does it drop with heater blower on, not A/C? How about headlights?Should check that as maybe you have an A/C problem?

  5. #5
    Veteran 0rion's Avatar
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    06 duramax

    I remember buying brush kits and rebuilding alternators when I was in high school. I rebuilt more than one. I haven't rebuilt one in many years though.

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