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...


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