Question about 1986 Buick Regal

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Battery drainage pulled all fueses one at a time still showing load on reconnecting the battery cable. the alt.light is flashing at times while driving but alt. output is fine.alt.light off while switch is in the on position.this car will drain a new battery down to 60% over night?

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  • Lucky king Jun 13, 2008

    the alt.light problem comes and goes but battery drainage is regular.

  • Lucky king Jun 13, 2008

    I have replaced the alt.twiced I do suspect the inturnal regulater.How do I check it?

  • Lucky king Jun 13, 2008

    I get 12 volts reading from neg. on battery and pos. to pos. on the alt. ALSO I get 7 volts reading to the alt case houseing?

  • Lucky king Jun 13, 2008


  • huffj81 Jan 01, 2009

    i put a new alt. in it and a new battery and still dies down



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Possibly any of the diodes inside the alternator (most likely). In some instances, it could also be the regulator whether it be internal;/integrated to the alternator or external.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jun 13, 2008

  • Louie  Role
    Louie Role Jun 13, 2008

    Hi again,

    The battery drain might be due to a shorted diode while the intermittent ALT light might be a loose joint/connection on any of the diode in the matrix.

  • Louie  Role
    Louie Role Jun 13, 2008

    Hi again,

    To my knowledge the alternator casing/housing should be at 0 voltage. It is physically and electrically grounded; therefore there should not be a 7 VDC at the casing/housing. Being the case, might it not be a loose grounding problem? You can always re-enforce the alternator casing/housing grounding by placing a ground ******** any of the small alternator housing bolts and the engine block or car chassis or even the negative terminal of the battery.



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