Question about 1993 Buick LeSabre

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93 Buick LeSabre. Battery not charging

93 Buick LeSabre. Battery not charging. Battery and alternator are both good. I did notice the volt meter needle (in the dashboard) jump from 10 volts to 14 for a while but now it is at 10 volts. All of the connections are good, there is no corrosion. What are the 2 wires on the connector that are on the connector. When the ignition switch is on the red wire is electrically connected to the + voltage of the battery. I could not determine where the black wire is connected. The wires are about 6 inches long before they go tino the wiring harness. Is the black wire on the connector a ground?

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  • garysmock Sep 04, 2009

    The alternator has been removed and tested good. Should the black wire be grounded all the time? I checked the black wire for a continuity to ground. The black wire is not connected to ground.

  • garysmock Sep 04, 2009

    Are the 3 wires:

    1 - Large gauge wire connected to post on back of alternator and connected to the battery.

    2 - Smaller gauge red wire in the connector. This wire is connected to + battery voltage when ignition switch is turned on.

    3 - Samll gauge black wire in the connector - ground.

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My 93 lesabre did the same thing problem was it wasnt getting a signal from computer telling the alternator to charge. Probrably a bad fusible link so i ran a jumper from the battery side of alternator and spliced into red wire on the two wire connecter now it charges constantly. Fifteen minute fix 5 inches of wire fit neatly. Bill hewitt

Posted on Feb 15, 2013

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Use a volt meter while the car is running to check the main wire or large red wire coming off the back of the alternator it should read a steady 14 volts, the volt meter must be set at dc 10 amp settings, ground the black wire to ground or a metal surface some where on the car and touch the red probe wire on the volt meter to the main terminal of the alternator as i said it should read a constant 14 volts if it doesn't the alternator is bad.

Posted on Sep 04, 2009

  • Mark Babineau Sep 04, 2009

    There should be 3 wires and yes the black should have continuity this is most likely your problem a bad ground

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93 Buick LeSabre. Battery not charging. Battery and alternator are both good. I did notice the volt meter needle (in the dashboard) jump from 10 volts to 14 for a while but now it is at 10 volts. I...


CHECK THE BATTERY TERMINALS, THEY MAY NEED TO BE REPLACED. BEFORE YOU REPLACE THEM, CHECK THE PLUG ON THE BACK OF THE ALTERNATOR FOR TIGHTNESS AND CORROSION. ALSO CHECK THE GROUND WIRE ON BOTH ENDS. I HOPE THIS SOLVES THE PROBLEM. THANKS FOR USING FIX-YA. PLEASE KEEP ME POSTED. GOOD LUCK

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