Question about 1999 Buick Park Avenue
The only way to find the problem is is to hook up a amp meter and then seeing the draw start pulling fuses until the draw goes away.. Its possible also that you have a bad battery even tho it tested good, that is if you had it tested yet, which would be the first thing to do. Also that same test for the battery will test the alternator. A bad diode in a alternator can cause a draw also even tho the key is out of the vehicle.
Last choice is you have a body control module not shutting things down after the key is removed. This would require a replacement computer or BCM as they call it.
As you can see about the only thing you can do at home is get the charging system checked out. Without the knowledge and tools and information there really isnt much you can do at home other than guess.
If you have 12 volt meter place it on the battery and crank after the battery is charged. Since you don;t want it to start for this test unhook the ignition module connector. If the voltage drops below 11 volts you have a bad battery..
Posted on Sep 01, 2010
You have a hidden consumer, one that is constantly on when it shouldn't. To find out which you will need an ampmeter and a lot of time you are going to test every single wire in your car. Put the ampmeter between the - of the battery and the - cable that goes to the body and disconnect every cable attached to the battery. Now start attaching them - when the ampmeter will show a flow of current then you will know that the hidden consumer is on that cable. Go to the next connector on that cable and disconnect it - if the current stays then the consumer is somewhere in between, if not then it's after that connector. Keep searching till you find it - when you disconnect a wire that is attached to only one final consumer and the current stops.
Since this is going to take some time, to prevent the death of the battery, from now on disconnect the battery before the night and plug it back in the morning.
Posted on Sep 01, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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