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Unread 01-23-2010, 02:37 PM   #1
macg1777
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Battery Drains While Vehicle Is Parked

I have a 85 CJ7 4.2 and battery power is draining. I did follow one of the suggestions I saw on another post by removing the negative battery terminal and use a test light from post to terminal and pull fuses until the light goes out or goes dim. The test light is not lighting real bright when I do this so I would imagine that there is not a large draw on the battery but if Jeep sits for a week I have no battery power at all. The battery is new and I did recently remove it and got it tested and the battery is good. Any other suggestions on what could be draining the battery. Thanks

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Unread 01-23-2010, 03:02 PM   #2
Coiz
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Do you have an ammeter? Pull off the negative cable and hook one meter lead to the cable and the other to the battery post. Read how many milliamps it is pulling and perform the same test with the fuses. Also don't forget to unplug the alternator, coil and ignition. Be careful not to hook up a mA meter then go and turn on the headlamps, you'll pop the fuse in your meter.
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Unread 01-23-2010, 03:09 PM   #3
IdahoJeeper
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What about the dash clock? How much does that draw?

I disconnected mine a while ago for this reason (killing battery) but have been kicking around hooking it back up.
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Unread 01-23-2010, 03:10 PM   #4
blownsvtlightni
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Quote:
Originally Posted by Coiz View Post
Do you have an ammeter? Pull off the negative cable and hook one meter lead to the cable and the other to the battery post. Read how many milliamps it is pulling and perform the same test with the fuses. Also don't forget to unplug the alternator, coil and ignition. Be careful not to hook up a mA meter then go and turn on the headlamps, you'll pop the fuse in your meter.
perform this test, but instead pull fuses until the drain drops. 0.050 Amps or lower is the typical spec for newer cars. yours should be lower.
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Unread 01-23-2010, 04:01 PM   #5
macg1777
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It does not have a dash clock. Thanks
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Unread 01-23-2010, 04:02 PM   #6
macg1777
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Could something else be drawing that is not fused?
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Unread 01-23-2010, 06:14 PM   #7
1986cj
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I had a problem with my Mothers car just like this. I removed the neg battery cable and with the test light it had no light. The damn thing has power everything on it. The battery was about 10 months old (84 month Autolite) and I had it tested (Checkers) more times that it should have been. Always tested good after they charged it. Well I had charged it up real good and let it sit unhooked from the battery cables for 3 days, then hooked it back up and sure enough it was dead enough it would not turn over the car. Took it back to a different Checkers and told them that it was junk and when they tested it, guess what, it had a dead cell. Replaced it and been good for a year now. Don't assume the tester or equipment they use is any good at testing a battery. I had fought this for about 5 months. So I would say charge it good and then let it sit for 2 or 3 days then hook it up and see if it has any power in it.
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Unread 01-23-2010, 07:11 PM   #8
Andy5150
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My cj-7 just did the same thing. I returned from a week vacation only to find my battery deader than Abe Lincoln. I jump started it and it fired up, and will restart just fine the next day. I put a volt meter acroos the battery terminals right after i shut the motor off, and it read 12.6 volts. The next morning, it was 12.3. With the motor idling, the voltage is 14.5. I did the test light on the negative terminal to the cable, and its fairly bright, and taking out each fuse did nothing. I,m stumped. The battery is 2 weeks old. I disconnected the battery and I,ll see if it still drains to 12.3 volts overnight.
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Unread 01-23-2010, 07:14 PM   #9
fredrok
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Quote:
Originally Posted by macg1777 View Post
I have a 85 CJ7 4.2 and battery power is draining. I did follow one of the suggestions I saw on another post by removing the negative battery terminal and use a test light from post to terminal and pull fuses until the light goes out or goes dim. The test light is not lighting real bright when I do this so I would imagine that there is not a large draw on the battery but if Jeep sits for a week I have no battery power at all. The battery is new and I did recently remove it and got it tested and the battery is good. Any other suggestions on what could be draining the battery. Thanks
I'm confused. You just described the best way to test for the draw, but you're not going to do it? The light does not have to be bright to kill the battery over time. Pull fuses until the light goes out and you've found the draw. (their could be more than 1)
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Unread 01-23-2010, 07:16 PM   #10
76 CJ5
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out of curiosity does the horn work? my 76 had a problem with the horn switch in the steering wheel, you could hear it clicking(after I unhooked the horn) and it would eventually kill the battery. I solved it by putting a big switch on the positive side of the battery
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Unread 01-23-2010, 07:24 PM   #11
1986cj
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Andy, you disconnected the neg battery cable and clipped the test light to the cable end and the probe to the neg side of the battery and it lights? You should not have any light at all.
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Unread 01-23-2010, 08:05 PM   #12
macg1777
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The light should light when you pull the cable if you have a dash clock or a radio that holds memory shouldn't it?
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Unread 01-23-2010, 08:14 PM   #13
macg1777
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Fredrok I did do the test as I mentioned. The light stayed lit and did not get dim or go out as every fuse was pulled.
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Unread 01-23-2010, 08:16 PM   #14
Coiz
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Quote:
Originally Posted by macg1777 View Post
The light stayed lit and did not get dim or go out as every fuse was pulled.
You are trying to use a crude tool, the test lamp, for a specific type of measurement. When you hook up a test lamp in series like that, any draw in the system must travel through the test lamp to get back to ground. Therefore, the more draw in your system the brighter the lamp. The lamp is crude in that it only tells you there is a draw, not how much of one. An ammeter hooked up in series will tell you the actual draw in mA on the system. As you pull fuses or disconnect parts (alternator, coil, ignition), you will know exactly how much each one contributes to your draw. As stated earlier, the spec for newer cars and trucks is .050 mA. A full charged battery should last 2-3 weeks with no problems on a .050 mA draw.

Have you unplugged the alternator yet?
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Unread 01-23-2010, 08:23 PM   #15
macg1777
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I think that I need to invest in a meter. I have not unplugged the alternator. Could that draw from the battery when it is parked?
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