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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check your battery cable connections. Remove cables from post, clean with post cleaner, $3 at Kmart, Sears, auto store.
If that is not it, have auto store test battery (for free) after you charge battery. You could have a shorted cell in the battery.
Check to see if battery is being charged by alternator this way:

  • Test battery voltage with volt meter. It should read about 12 1/2 volts. (Engine off).
  • Test battery with engine running. It should read about 14 volts if the alternator is putting out.
Hopefully it's just dirty battery connections.

If this solves your problem, please rate as fixya. And, good luck. Report back results.

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Before, you buy a new Alternator or Battery... Check the Battery with a DC-Volt meter. It should read 12.5 volts or more with the key off. If the Battery reads less then 12.5 volts, have it charged free at Autozone or O'Reiley's auto. If the voltage is 12.5 volts or more, start your engine. With the engine running check the battery voltage again. It should read 13.5 to 15.5 volts. IF YES, Your charging system is work fine.

**IF NOT, and your Battery voltage 12.5 or less, You DO have a charging problem. It must be 13.5 to 15.5 volts!!! 1 - The first thing you want to check is the Battery cables and Battery post contacts. Remove the Negative cables FIRST!!!! Then the Positive, Clean the battery posts and cables with a wire brush!!! There are (3) Large Black cables on the Positive post of the battery, one goes to the starter, one goes to the relays & fues on the fire wall, and one goes to the back of the Alternator Battery output terminal.

Remove and clean the cable, nut & terminal of the Alternator with a wire brush. Then, reconect it tight to the Alternator output terminal. Now, there is (1) Large Black cable & (2) small wires on the Negative post of the Battery. The Large one goes to the Engine Block Ground. The small ones go to the front fender screw on the passenger side car body. Clean them with a wire brush. The most IMPORTANT GROUND is the Large Black cable from the Negative of the Battery going to the ENGINE BLOCK!!! To Remove & wire brush them clean, fallow the Large Black cable going to the Engine Block under the side coil assembly. Remove (3) NUTS & a triangle metal shild. clean all (3) wires & the Bolt & NUTS. Re-assemble very tight!!!

When completed, Reconect the Positive Battery cables firt! Then, the Negative Cables. Make sure they are all making good contact and are nice & tight. Now, check your battery voltage again with the car off! It should be 12.5 volts or more. Re-start the car, Check the battery voltage for 13.5 to 15.5 volts. IF - YES....IT'S FIXED! IF - NOT.... Turn the car OFF & look for a small black conector that plugs into the side or under the Alternator. It will have only (1) small RED wire going to it.
Very carefully, stick a straight-pin in the red wire & let the pin come out the other side. Don't let it touch any metal !

Start the car & let it run. Now put the (black) lead of your DC-Volt-Meter on the Negative of the Battery. Then, put the ((red) lead of your meter on the straight pin. It MUST have 8.0 to 12.0 DC-volts there !
IF - YES... The regulator inside the Alternator in BAD. (REPLACE) the Alternator. IF - THERE IS NO VOLTAGE there... Then, the red wire is bad... or the (P C M section) inside the ENGINE CONTROL MODULE is BAD!

The Alternator is about $100.00, The red wire is about $2.00, But the ENGINE CONTROL MODULE is about $400.00 plus from a dealer. Only, about $170.00 from autozone and about $125.00 from a wrecking yard.

**** NOTE **** If your Engine Control Module is bad, Look for my INFORMATION on FIX-YA, "HOW TO REPLACE THE ECM on a 94 BUICK" Thanks and GOOD LUCK !!!

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