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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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Posted on Jan 02, 2017


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Hello lucasoneg
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1 Answer


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
a draw. To isolate the draw pull the fuses one at a time, start with the interior light fuse so you don't
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

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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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2000 Jeep Grand Cherokee remote starter keeps draining battery

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1 Answer

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