Question about 1995 Buick Regal

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Battery will drain if left connected overnight

When I disconnect and reconnect it runs fine

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  • honeymokey
    honeymokey May 11, 2010

    What is running or on when battery is hooked up ? Lights,fans etc?

  • david doerfer May 11, 2010

    what year is the car!?

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  • 100 Answers

Your problem is faulty electrical, you have to trace your electrical wires for a shorted line or an electrical component is always on causing the draining of the battery.

Posted on Apr 25, 2009

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1 Answer

I have 2003 trailblazer new battery and fairly new alternator sets overnight and is dead. Jump off and will run fine until sitting. Need help?


have the battery load tested first
then have the alternator and voltage regulator check for correct operation by an accredited auto electrician

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I have a 2010 mercury Milan premier I had the battery charged yesterday which got the car started and today the battery is dead again


Could be two things.

The battery is worn out. How old is it?

There is a dead short that is using up power overnight as if a light is left on. Did you check for anything being on, interior light, trunk light etc?

Charge the battery, start the car, turn the car off, start it again in an hour and turn it off. Disconnect one of the leads on the battery overnight. Reconnect the battery and see if it starts. If it does, then you have a short that is draining the battery overnight. These faults are a nightmare to find!

Aug 12, 2015 | Mercury Cars & Trucks

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Battery drain overnight on a mercedes e320 2003


Unseen things can sometimes brain your battery. A trunk light that doesn't go off when the trunk is closed. Open the trunk and touch the bulb quickly, it should not be hot yet. If it is it's stuck on. The same goes for the glove compartment light.

There could be a problem with the alternator or even a battery that just won't hold a charge as opposed to an actual power drain. Fully charge the battery and then disconnect it for the night. Next morning reconnect it. If the charge is holding it will start just fine. If it doesn't then your battery is suspect.

May 03, 2015 | 2003 Mercedes-Benz E-Class

1 Answer

2001 Monte Carlo battery goes dead over night


check for loose / dirty ground wires and points
indicates a voltage circuit being broken and the ECM is loosing voltage to work

Jun 27, 2017 | 2001 Chevrolet Monte Carlo

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My 98 lumina has a constant power draw from somewhere. I just replace the battery and had the alt tested (it was good). I have to jump the dang thing every morning but if I drive it enough during the day...


The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
Also,do an overnight battery check by disconnecting the battery overnight,if things are fine the next morning after the battery was disconnected then it is a drain in the vehicle,if the battery is dead even after being disconnected overnight,,then the battery is bad.

Jun 15, 2017 | Cars & Trucks

1 Answer

My 97 Lesabre is draining the battery overnight. The battery is new, if i disconnect it the car starts fine when reconnected. there doesn't appear to be any lights or anything on. The car has IPM (?)...


Put an AMP Meter in series with either battery cable
& pull fuses one at a time until you find the circuit that
isn't timing out or going to sleep.

Should only have 35 to 45 milli-amps after 20 mins

So wait 20 mins then start with the fuses, if over 50 milli-amp

Jun 28, 2011 | 1997 Buick LeSabre

1 Answer

1997 Toyota Camry XLE has an overnight parasitic battery drain-I suspect the factory installed anti theft system. can this be diabled?When I remove - terminal over night and replace in the morning, car...


This should be done with everything turned off and the door closed. with negative battery disconnected. place 12 v test light between the battery terminal and the cable end.(on neg. side) if the light lites up there is a drain. remove one fuse at a time until u see the lite go out. that is the sytem the drain is on. usually glove box light or trunk light or visor light left on or stuck on.

Feb 17, 2010 | 1998 Toyota Camry

1 Answer

'99 Ford Windstar heater investigation turned into dead car


You seemed to have one problem then you developed another one. Here is my suggestion that loud screeching sound mean that you have a bad flywheel or at-least in one spot. If you manually turn fly wheel all the way around you should see chip in the teeth/gears of the flywheel. The other problem is during all the connections back and forth with the battery you may have blown the battery/main fuse,or may have burnt a fusible link, replace and you should re-gain power to start. If flywheel is damaged turn the damage part away from the starter and the vehicle should start with out screeching. Godd Luck contact if you need more help

Dec 28, 2008 | 2000 Ford Windstar

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