battery drains with no reason -
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post #1 of 10 Old 07-19-2011, 05:18 PM Thread Starter
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battery drains with no reason

I have a 1995 jeep grand cherokee limited. When you let the jeep sit overnight and you try to start the jeep it tries to start then quits and a loud clicking noises comes from the jeep somewhere (cant tell where the click is too loud to tell in the engine bay). after it starts the loud clicking the alarm goes off. if you cut the alarm off and hook jumper cables to the jeep it starts fine. Tested both alternator and the battery and both tested good. no lights are being left on at all not even the light under the hood or anything. Please help.

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post #2 of 10 Old 07-19-2011, 05:20 PM
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time to get out the multimeter and see where the drain is.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #3 of 10 Old 07-19-2011, 10:07 PM
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Did you load test the battery ???

I have seen part stores be wrong about alternators and/or batteries being good ...

it could just be the battery ...

a simple test is, after driving it (to charge the batt.), park it and disconnect the neg. batt. terminal over night,or even better, 24 hours and see what it does after reconnecting it ...
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post #4 of 10 Old 07-20-2011, 12:47 AM
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Your batt could be old and unable to keep the charge well. Happened to me, only my lasted 2 days. 3rd day I had to turn her on, otherwise she wouldn't crank without jumper cables. Replaced batt and all is well. The simplest test is what phitmein said, fully charge batt, disconnect (-) cable overnight or better two, and then see if it cranks. If not, the batt is goodbye. If it does, then ratmonkey's way - multimeter out & see who's missing the bedtime...

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post #5 of 10 Old 07-20-2011, 12:58 AM
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I had the same issue, I had to ground out my alarm system in my 1995 to stop te drain.

My alarm would go off randomly in the middle of the night for no reason at all.

Even when it didn't it would drain over night for no reason.

It went through 2 brand new batteries in 1 month and an alternator so that's when I said F-it and grounded the alarm. Only thing that seemed plausible.

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post #6 of 10 Old 07-21-2011, 04:55 PM
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i had a problem like this turned out to be the voltage regulator pcm
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post #7 of 10 Old 07-25-2011, 06:02 AM
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If you still have the hood light connected try dis-connecting it. That was what was pulling my battery down. It was staying on all the time.

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post #8 of 10 Old 07-25-2011, 06:04 AM
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Yup, that b'stard has mercury switch in it, can't see it, and if it goes south, light might either be on 24/7 or never come on.

Beauty is in the eye of the beer holder
* 1994 ZJ (by VIN) with a 1995 engine (PO knows why)
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post #9 of 10 Old 07-25-2011, 06:53 AM
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Section 8A of the Factory Service Manual describes the troubleshooting technique for finding a high-current, ignition off draw. The typical draw should only be 25 mA.

'93 Limited (sold), '96 Laredo
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post #10 of 10 Old 07-25-2011, 09:31 AM
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I know you say no lights are being left on but a sticky switch on the brake light @ the pedal was the draw on my wife's '98 zj.

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