'86 L98- Battery Draining
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Instructor
Joined: May 2011
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From: Miramar Florida
'86 L98- Battery Draining
Anyone have any idea where I should start looking. The battery in my car drains down when the car sits for more than one day. I verified that there are no lights staying on, I can't see any accessories that are staying on. Any ideas?
Safety Car
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From: SANTA CRUZ CA
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Instructor
Joined: May 2011
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From: Miramar Florida
Thread Starter
Instructor
Joined: May 2011
Posts: 213
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From: Miramar Florida
I will check the power seat motor, shouldnt, I be able to hear it running. When I was verifying that none of the interior lights were staying on, I sat in the car with all the doors closed & checked each light, I did not hear any motors running.
Bad diode in alternator? The alternator is also basically new, it seems to be charging the battery fine, the problem comes when the car is not run for a couple of days. As long as I run the engine, the battery gets charged with no problem.
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Thread Starter
Instructor
Joined: May 2011
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From: Miramar Florida
Burning Brakes
Joined: Jun 2005
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From: Wallingford Vermont
I would add the Climate Control to that "suspect list", if you have the C68 option. See Blower Motor Module.
PS. Might want to verify the battery, condition before and after. A bad starter solenoid can have intermittent resistance and mimic low cranking amperage.
PS. Might want to verify the battery, condition before and after. A bad starter solenoid can have intermittent resistance and mimic low cranking amperage.
Last edited by DanZ51; Mar 1, 2014 at 01:28 PM.
Race Director
Joined: Apr 2002
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From: Anaheim CA
The LCD fuse is for the instrument cluster. It keeps the cluster powered all the time so that it can remember your mileage and other stuff. The current draw should be pretty small.
The CTSY/CLK fuse supplies power to a LOT of circuits. Basically everything that has power on it all the time.
You can test the current draw by removing the fuse and then putting your DVM probes on the fuse connectors. Set the DVM on the current range and you'll probably have to move one probe to the current jack in the DVM. Polarity doesn't matter -- if you have the probes reversed the meter will just show a negative number.
The CTSY/CLK fuse supplies power to a LOT of circuits. Basically everything that has power on it all the time.
You can test the current draw by removing the fuse and then putting your DVM probes on the fuse connectors. Set the DVM on the current range and you'll probably have to move one probe to the current jack in the DVM. Polarity doesn't matter -- if you have the probes reversed the meter will just show a negative number.
Instructor
Joined: Mar 2010
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From: Kissimmee Florida
My 86 had a 350 ma draw and would kill the battery in a day or 2. found the problem to be the alarm system. Pulled the panel and took the fuse out. Problem solved.. thats just a suggestion..
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Instructor
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From: Miramar Florida
I'm thinking this is causing my problem. It is an aftermarket Viper alarm system however the problem just started happening about a month or two ago but the alarm has been on there for about a year! Disabling it will be the next thing I try.
