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Battery drain when all systems are off - 1996 Buick Century

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Key alarm sounds even after key is removed. Drained battery.


Make sure your Battery is fully charged. A partially charged Battery can make the alarm system malfunction. Also, make sure the
regulator is charging the Battery. Some key alarm systems can
and will drain your battery if the Car is rarely driven especially
if there is a ignition kill switch wired into the system. The key alarm
system on my Mercedes 560SL used to drain my battery whenever
I didn't drive the car enough.

Sep 08, 2017 | Cars & Trucks

1 Answer

Battery checked and holds its charge when earth lead and live lead connected the battery will go flat overnight


Something is being left on to drain a battery that quickly, or the system has a dead short in it somewhere. The only drain should come from the alarm system and chronometer in the radio to keep the time correct. That will only drain a battery in about 6 months of not being charged from engine running. I've found the easiest way to check if anything else is still draining power is at the fuse box. With switch off, test each fuse to see if there is still power on them. Then pull the fuse that is still powered and see what isn't working now and the grounded system will show itself. Just leave that fuse out overnight and see does the battery drain down. if not, go thru that system and find the short or faulty unit it's connected to. I always go directly to the grounds to fix problems if something isn't working, yet with your situation, the ground is causing the problem the other way. Something is still connected that shouldn't be.

Aug 17, 2017 | Cars & Trucks

1 Answer

Something's draining battery I go out to my car at lunch and only Bluetooth or radio is on and battery is dead in 5 mins.battery checked and it's good car has no battery issues except that


So you had the battery tested? Possibly the alternator or charging system is not up to par? Before you assume there is a drain, first make sure both battery and charging system are working good.

Best to buy a cheap voltmeter (or multifunction meter) to do any testing. Put a voltmeter on the battery, with key off, volt reading should be at least 12.4 volts-any less, like below 12 volts, then battery is not taking full charge OR the charging system is at fault. Now start the car and put voltmeter on the battery again: the reading should be at least 13.5 volts- somewhere between 13.5 and 14.5 volts. If it is, then charging system is good. If both battery and charging system check out, then you start looking for an unintended drain. YouTube has lots of videos on how to find an unintended drain.

Feb 25, 2017 | Cars & Trucks

2 Answers

Red light on radio keeps flashing and battery drains overnight on 2002 sonoma gls


That red light is on many vehicles and does not drain a battery that fast. You probably have another draw on the system. I recently had a car that the battery would go down in a few days, found out it was coming from the Onstar system malfunctioning.

Nov 03, 2016 | 2002 GMC Sonoma

2 Answers

Have a 1994 lhs v8 battery is always dieing wats causei g the problem


A failed/ worn out battery or a current
drain you have to find

Could be the alternator
Could be many things

Nov 21, 2014 | 1994 Chrysler LHS

1 Answer

My transit van on a53 plate, is draining the battery, I have had new alternator, and battery but it is still draining battery,


Battery drains are always fun. Generally it means that something you either hooked up recently to a direct hot wire is draining the battery or there has been a wire that got hot enough to melt another wore on the system and cause a full time connection. Other than taking it to the dealer and letting them put a breakout box on your system to isolate the problem, you could put a volt meter on your battery, if there is truly a drain on the system you will see the volts slowly drop, then open your fuse box and one by one start pulling fuses until you find the one that's pulling on the battery, (you'll know this when the volts on the meter stop dropping). When you find the fuse that's pulling the volts down, you'll then be able to start tracing the circuit for that fuse and everything connected to it. It's a PIA but it's something you'll have to do, unless you want to pay dealer prices.

Nov 19, 2014 | Cars & Trucks

1 Answer

Mitsubishi Diamante 2002 - slow battery drain when not running.


This problem may be a drain or a bad battery or alternator.

The first thing to do before going on trying to find the system that is draining the battery would be to have the battery tested and charging system tested.

A weak battery will seem ok after the car is jumped or will barely start the car and the alternator will charge it even though the alternator is overworking due to weak battery and during the day or when car does not sit long it will seem ok. then when car sits overnight or a few days battery will weaken on its own, making it look like a drain,

so first step is battery test and alternator/charging system test.

Jan 06, 2013 | 2002 Mitsubishi Diamante

1 Answer

Is it possible that a malfunctioning odometer on a 1996 mercury sable would keep draining the battery? every other option has been tested for any shortages through the electrical system...the battery has...


If you have a good battery and it is draining to the point of not starting in an hour, you have a serious drain on the battery! I would first test the charging system to be sure it is working properly, 13.7 to 15.1 volts with the engine running.
Next, I would put a current meter inline with the battery (engine & ignition OFF) and see what the drain is. Don't do this if you are not familiar with measuring current drain, as you can easily destroy your meter. Based on the amount of this drain, I would move to the fuse panel and remove fuses an look for the same drain. This will tell us which system the fault is in.

Oct 20, 2009 | 1996 Mercury Sable

1 Answer

1998 Corvette drains the battery in less than 2 days.


No, corrosion will not cause a battery to drain, even if the corrosion is on the terminals. Several factors can cause battery drain, I would first have the battery tested to see if the battery it self is not bad. If the battery is good, then the most common is a short. All most all new cars have a certain amount of drain,(measured in milivolts) this drain is for clocks and computer memory's, and it would take several days of a vehicle sitting for the battery to be drained. Don't immediately assume you have a problem if you see 2-6 milivolts of drain on a battery with the key out, now if your battery is being drained after being parked over night, you have a problem. The easiest way to pin down the problem short is to disconnect your positive battery cable from the battery, take a 12 volt test light and clamp one end to the positive cable, and hold the probe to the positive post. Now if you have a short the light will come on. Have someone help you by pulling the fuses one at a time. If when a fuse is pulled the light goes out you have isolated the short to that system. If you pulled all the fuses and the light never went out try disconnecting all the wires from the alternator, 9 times outta 10 do this will let you know where your short is. If the system is not critical like power locks some people just leave the fuse out. 

Mar 05, 2009 | 1998 Chevrolet Corvette

1 Answer

Battery drain


That is easy to track down, ok full charged battery, then connect an inductive pickup ammeter that can read milliamps around the positive battery cable make sure all lights and doors are closed and read the drain on the system anything more that .003 amperes is excessive remember that the PCM has a KEEP ALIVE MEMORY and that cannot be shut off so don't worry about that it's so slight that you won't see it.
if you see a drain start unplugging fuses one at a time and lay them out so you know where they came from, keep goin until you get a drop on the reading and that is the circuit that is draining current.
How long does it take do drain a full charged battery?Check glove box lights
trunk lights
underhood lights
aftermarket alarm systems
Amps for the stereo
A bad alternator can drain a battery

Sep 28, 2008 | 1995 Toyota Camry

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