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While charging the battery drains - Cars & Trucks

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Sounds like you need to try new battery

Posted on Dec 15, 2016


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Posted on Jan 02, 2017


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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

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

Battery drains when engine and lights are off ?

It either has a short circuit or the battery is shorting out.

Jun 07, 2015 | Cars & Trucks

1 Answer

Battery is drain

drained, past tense?
if you didnt use a voltmeter how would you even know its drained.
or was that just a guess?
the battery is charged if the voltage (rested) is 12.6vdc.
if not charge it.
if it keeps discharging, parked, that is called a phantom drain.
if it only discharges driving ,that is a bad charge SYSTem in car.
are the battery cable lugs clean (a standard service point)?

Mar 18, 2014 | 1998 Jeep Cherokee 4WD

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

I have a2002 trailblazer and the battery drains after sitting for 3-4 hours. The battery will charge right up, but if left for a period of time, the battery goes dead.

In most newer vehicles there is a built-in battery drain caused by features that have a "memory" such as your radio.
Especially in cold weather, that drain is too much for a marginal battery to deal with.
If you are charging the battery by running the engine, that won't help. The battery needs to be fully charged with a battery charger. Load test the battery after charging. If it fails or comes up as marginal, replace it. otherwise, you will need to begin testing for an excessive power drain.

Feb 03, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

New battery going flatafter draining it by accident overnight. jump started it, drove home, but battery flat again after a day or two.

battery needs a deep charge from a battery charger.if you drain battery to low the alternator cannot supply enough charge to bring battery up to full charge.

Nov 27, 2009 | 1993 Volkswagen Eurovan

1 Answer

Peugot expert van draining battery when everything is switched off When jumped started the battery charges quickly, but switch off the engine and in ten minutes the battery is totally drained. Help greatly...

either change the battery or the alternator,,just either of those,,,if your battery is no good it wont hold charge when started,,,also if your alternator is no good it wont charge your battery when engine is running,,,(it can also drain your battery if faulty)..get a second hand alternator in a breakers yard maybe a batt too much cheaper,,,hope i helped you,,

May 08, 2009 | 1991 Peugeot 405

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