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Light circuit still drawing on battery after everything turned off

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A car battery might lose some of its charge for other reasons. An electrical short or an accessory that is not functioning properly could cause excessive drain on a battery. Another possibility is that the switch or relay for a rear window defogger might get stuck in the "on" position, which would draw power from the battery even after the engine is turned off.
This all has to be checked bymeter.Check the connection of battery to starter and battery to alternator.In some cases it has been seen that Ignition switch does not turn the car off.It shows off but actually its faulty so it does not turn the car off,you think you turned the car off by key,but the car is still on due to faulty ignition switch.Get the ignition switch and ignition lock module checked.
Also check the interior light switches and wirings. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation

Posted on Sep 07, 2010

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Amp draining battery overnight.have new battery and new alternator.switch off everything and still draws amp flatting battery


The luggage compartment light is often forgotten and causes this problem.

If that proves ok you have to discover which circuit is drawing the current by initially removing each fuse in turn and connecting an ammeter across the fusebox terminals. The task of locating and rectifying a current drain is typically either ridiculously simple or complex and time consuming and require lots of dismantling and a good wiring diagram.

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Short circuit? Stuck relay? For relays, hook up good battery, give it a few minutes then feel the top of all relays with everything turned off. If you find a hot relay determine what it is for and remove it if car will still run. No more battery drain = replace relay with a new one. If this does not help, you can find which circuit has the short by removing fuses and using amp gauge to test circuit for excess draw.

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You have a wiring problem. .it's creating a draw on the battery. .you pull each fuse till draw goes away and your short is in that circuit. .

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I guess my first question would be how do you know the battery is ok ?
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The normal process is to disconnect the battery and let it sit - check the voltage every couple of hours.
If the battery is ok, you will need to disconnect the major sections - circuits on the vehicle and test for drains one at a time until you find the circuit that is using voltage with everything switched off.
Sometimes you can pull major fuses and then put them back one at a time. Putting a test light between the neg cable and the battery post will tell you if a circuit is drawing current. If everything is off the test light should not glow after you first connect it.
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Alternator is good but battery keeps dying have to ... is good but battery keeps draining


Hello lucasoneg
If the battery is drained after sitting for a while or overnight, you may have a draw on the electrical
system. To check for a draw make sure all elec. devices in the car are off keys out of ignition dome
light off etc. Next, remove the neg. battery terminal and take a 12V test light clip one end to the
negative terminal and the probe end to the neg. battery post. If everything is off and the test light is
on, there is a draw. To isolate the draw, remove and replace the fuses one at a time until the light
go's out. When it,s out, the last fuse pulled is on the circuit with the draw. Hope this is helpful.

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1 Answer

I PUT IN A BRAND NEW BATTERY BUT WHEN THE CAR SITS FOR A DAY OR TWO THE BATTERY HAS LOST POWER AND THE CAR NEEDS A JUMP TO START.


Hello chuck5227
It sounds like there is a draw on the system. To test for an electrical draw, turn off everything in the
car, remove the keys and close the doors. Open the hood, if the light under the hood works unplug it or remove the bulb to avoid a false read. Remove the negative battery terminal, take a 12V test
light clip one end to the batt. terminal and touch the other end to the batt. post. If it lights up theres
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have to hold the button in. Remove+replace the fuses one at a time until the light go's out. the fuse
you removed controls the circuit with the draw. Check the wires-connections and switchs on that
circuit. Before you start pulling fuses take a picture of the fuse block with a digital or your cell phone camera, this way if somthing unintended falls off or out you'll know where it go's.
Hope this helps.

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1 Answer

My 1997 grand cherokee has a draw that drains my battery every 3 days, grounding from the neg. post to the neg ground with a test light goes on brite, pulled all the fuses and relays still have draw?????


OK this should be simple to locate - you will need a ammeter. Disconnect the negative lead on the battery. Connect the ammeter in series between the disconnect lead and the battery terminal and with everything off take a note of the current draw. Switch on an interior and note the extra current drawn. With everything off (door closed etc) check the current. Ordinarily this should be very low, perhaps just enough to keep the clock running and the anti theft system active. Open the fuse box lid and remove and replace each fuse in turn noting any change to the current reading. Each fuse corresponds to an electrical circuit and by a process of elimination you will hit on the culprit circuit, the one drawing current and killing the charge in the battery. Most times the guilty party is a glove box light that fails to go off when the glove box lid is closed, the problem here is that when the lid is closed you cannot see if it switches off as it should. If it is a short you will have to locate the break in the insulation and fix this. In the mean time you can assess if you can run the car safely without the offending circuit having its fuse left in, better to have car that starts than say having a sun roof that is temporarily out of action

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1 Answer

2000 Jeep Grand Cherokee remote starter keeps draining battery


A Simple Battery DRAW test w/ test light to Determine there is a Draw on Battery. With EVERYTHING OFF will determine that Something is Drawing Battery Down. Test light "Clamp on Neg" At Bat And the POKER AT CABLE, if it lights up you have a Draw
To Determine were it is, Pull Fuses out 1 by 1 Watching Light puting Fuse back in When you Pull a Fuse that turns the Test light off you found the Circuit that is Draining the Battery if it is A Circuit that Remote Starter is Connect to refer to Installer to Correct the Problem

NOTE TEST Light Connected this way and Electrical System in Tact Light WILL NOT BE LIT at ALL
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1 Answer

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you need to check for a draw if the battery is dying when it sits, remove the NEGATIVE battery cable and place one end of a bulb style test light or just a 12 volt bulb in a socket with wire leads , so one of the wires will go on the NEGATIVE battery POST the other wire will go on the NEGATIVE battery CABLE this will complete the circuit (do not turn the key on like this) make sure everything is off including door lights, if the bulb is lit you have a draw. start by pulling fuses one at a time until the lite dies whatever fuse you removed that killed the light is causing your draw and that circuit should be inspected closer good luck and i hope this is what you meant please rate -jeff

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