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Thread: Alternator

  1. #1

    Join Date
    Jan 2002
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    Binghamton, NY
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    1,241
    Corvette(s)
    1981Dark Blue Metallic & 2004 conv. magnetic red

    Default Alternator

    My alternator was bouncing all over, from 8 volts to 16 volts and decided to replace it. Put in a rebuilt one and now it is holding steady at about 12+ volts. Is this about right? I recall that before the first one went bad it was at 13 volts, is it possible to get bad one. I purchased a heavy duty one which is 70 amps and that is what is called for.

    I appreciate your input.
    Chuck

  2. #2
    Dave L.
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    Default

    Chuck - My guage reads 13-14. I also have the 70A alt option on my car.

    Dave

  3. #3
    Member iron cross's Avatar
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    Feb 2003
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    Dearborn Mi.
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    308
    Corvette(s)
    Unrestored one owner 1962 Black FI car

    Default

    Voltage should read from 13.6 to 14.4 when running! Amps is merely the output of the unit to run accessories. Not all Vettes have high amp alternators.

  4. #4
    Nut
    Member Nut's Avatar
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    Oct 2000
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    2002 Torch Red Convertible

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    Chuck.... mine runs around 14+. I put a 85amp alt in it last year after 21 years with the OEM 63 amp unit.

    ............ Nut
    Tanned, rested and
    Retired in the Peoples Republic of MD

  5. #5

    Join Date
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    1981Dark Blue Metallic & 2004 conv. magnetic red

    Default

    Thanks for the replies, mine is about 13 amps and decays to about 12.5 while driving. No starting problems or any other noticable things but I think that I got another 63 amp alternator not the 70 amp I asked for.

    Chuck

  6. #6
    vettenick
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    Default

    A quick check if the alternator is up to the task is to monitor the voltage after you've turned all of your items on; headlights, a/c, rear defogger, etc. If the voltage drops below 12.8 volts, you have a problem. If the voltage stays up where it should, then it's able to produce all the amps your car needs.

  7. #7
    Member 81 Corvette's Avatar
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    May 2003
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    660
    Corvette(s)
    1981 Pearl White

    Default

    quick side questions...where does the guage connect into the system. Mine had a bad connection someplace, as it often sits dead left but the car runs fine.

  8. #8
    vettenick
    Guest

    Default

    The voltmeter is mounted on a printed circuit board behind the cluster lens. From there, it gets its power from the gauge fuse and it's connected through a pink/black wire. The other connection(its ground) is through a black wire that's grounded to the instrument panel ground. The ground location is on the driver's door hinge post right above the courtesy light switch.

  9. #9
    Member 81 Corvette's Avatar
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    1981 Pearl White

    Default

    thanks

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