Question about 1993 Buick LeSabre

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A new battery has drained and the alternator has passed its testing..what is the problem?

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How are the wires looking that go to your alternator? Also, check your battery cables! Make sure they are clean at the battery terminals.

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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06 bug drains battery over night


On most 12v cars,the #1 cause is a light left on somewhere in the vehicle.#2 cause is a bad diode in the alternator and #3 is a bad battery which self discharges and is usually over 5 years old.
An easy first step is to disconnect the charged battery over night.If it still has a full charge the next morning,after you reconnect it and if the car starts,you can rule out the battery as the culprit.Now,if the battery passed the first test,now we go onto #2 test and disconnect the alternator output wire from the alternator overnight.If the battery still has a full charge the next day we will now know the alternator has a bad diode and will need to be repaired/replaced.If the battery was found to be low on charge the next morning with the alternator disconnected we will now have to go on to test #3 to find the drain in the vehicle. Disconnect the positive battery cable and place a 12v regular bulb type test light between the positive cable and the battery positive post.You should have a bright light on the test light if you have a drain in the vehicle from the battery.(don't worry about a dim light as electronics need a little memory voltage) We are looking only for a bright light.With the key off (as it would be overnight) you are now going to remove one fuse at a time while watching the brightness level of the test light.Take one fuse out, look at the light and if no change in brightness put the fuse back in and on to the next fuse,one by one until you see the light go out or dim.The fuse that dims or removes the bright test light will be the circuit that is draining your battery.Now you have your "battery drain" circuit identified and can inspect/repair the item/items on that circuit.
REMEMBER an open door,trunk or hood may cause a FALSE bright light on your test light because of courtesy light switches and alarm switches so manually close those switches if you need to keep one of the doors or hood/trunk open to gain access to the multiple fuse boxes in many vehicles.
DO NOT TURN ON THE KEY during this test, as all power to the vehicle is now going through the test light and things won't be happy if you do.

Apr 09, 2017 | 2006 Volkswagen New Beetle

2 Answers

98 crysler concorde wonr hold charge pulled alternator tested good put back in but still drains battery


Has the battery been tested? Have you run a battery draw test with a multimeter set to milli amps? If so what is the reading? Also check and make sure no lights are on in the car, check the visor vanity lights, glove box, console if equipped, trunk all of them, do it at night.

Oct 12, 2016 | 1998 Chrysler Concorde

2 Answers

New alternator and battery but still drains battery and dies while driving.


Possibly a bad fuse which is not allowing the power from your new alternator to make it back to the battery. Do you have alternator voltage making it to the battery when running?

Mar 16, 2014 | Volvo 240 Cars & Trucks

1 Answer

I have a 2001 Honda Civic that would not crank and battery would not hold a charge, so I replaced the battery. It started up right away; then, the car sat for the weekend and when I went to start it this...


It could be a charging issue. But it could also be that something is draining the battery. To test the alternator you'll first have to charge the battery using a battery charger. Then follow this test.
http://ricksfreeautorepairadvice.com/test-an-alternator/

If the alternator passes, then conduct a battery drain test with this procedure
http://ricksfreeautorepairadvice.com/battery-dead-morning/
Battery dead in the morning Ricks Free Auto Repair Advice

Oct 15, 2017 | 2005 Volkswagen Jetta

1 Answer

Something is draining my battery. I have had the battery, alternator, and starter tested, and they all have passed. I have also done a check for codes it comes up done, with no codes. What can be draining...


Just about any component can cause a drain.
Someone would need to use a meter or test light to check every circuit for a power usage when the circuit is supposed to be off.

Feb 21, 2013 | 2005 Dodge Caravan SXT

1 Answer

Alternator making noise had it checked out it passed the test got new battery other one was drained now dash lights get bright and dim really fast


The most common thing which fails in alternator and create noise is bearing failure. I think you should check for that once.

Performance Product Store

Nov 07, 2012 | 2004 Chevrolet Blazer

1 Answer

When driving car it will all of a sudden start going dead. Battery will discharge have to recharge or boost off even with new battery it drains the charge driving about 3-4 miles is this a problem with...


It sounds like your alternator is defective and draining the battery.
Since the alternators function is to charge the battery, if it's not working you will be running off battery power. With a short in the alternator that would explain the sudden drain on the battery.

BUT before you buy anything have the alternator tested first. It could be something more simple like a bare wire grounding out against metal, which would cause the problem.

Simple things first, so test it before you buy a new one. A parts store will test it for free.

Even still I suspect the alternator. A new will cost $160 maybe more.

Feb 16, 2011 | 1992 Lincoln Town Car

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