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Old 09-18-2008, 08:51 PM   #1
MikeyAE86
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Member#: 185525
Join Date: Jul 2008
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Location: Fresno California
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Default Battery Drain - Im stumped

Just today ( this car knows im selling it i swear) on my corolla the battery dies in less than 1 hour of a full charge.

The battery is in perfect condition. I swaped it with an optima from my other car, still drained it.

Alternator is great, i pulled the cables off the battery and it ran on its own.

i dont have any wires that arent switched (sterio ect) that could be drawing power. i dont have an alarm.

someone said that its possible that the alternator could be drawing from the battery once its switched off ( ill be testing that theory next)


anyone else have any ideas?
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Old 09-18-2008, 11:06 PM   #2
rkramer
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it dies in 1 hour with the engine off? something is drawing SERIOUS power, on the order of at least 10 amps if not 20+. whatever would be drawing that much would be glowing red hot or at least smoldering.

i'm leaning towards more a very bad ground or corroded battery terminal.

ohh, and never pull the battery cables off a car while it is running, ever. You are very lucky you didn't fry the ECU, don't do it again. The battery helps the alternator regulate power. Without it you can get some serious voltage spikes, easily enough to fry an ECU instantly.
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Old 09-19-2008, 02:30 AM   #3
MikeyAE86
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Quote:
Originally Posted by rkramer View Post
it dies in 1 hour with the engine off? something is drawing SERIOUS power, on the order of at least 10 amps if not 20+. whatever would be drawing that much would be glowing red hot or at least smoldering.

i'm leaning towards more a very bad ground or corroded battery terminal.

ohh, and never pull the battery cables off a car while it is running, ever. You are very lucky you didn't fry the ECU, don't do it again. The battery helps the alternator regulate power. Without it you can get some serious voltage spikes, easily enough to fry an ECU instantly.

Yeah i wont do that anymore.

thats whats not making any sense. I put my car on a alt tester and its putting out 30 amps at 2k rpm witch by my chiltons is normal.

When i was driving it though i was getting a low charge light once i passed 3k rpm...

anything under it was fine.
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Old 09-19-2008, 01:19 PM   #4
Cougar4
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What DMR stated is correct. Bad grounds and corrodid terminals add resistance to the circuit. This problem is draining excessive current from the battery.

The problem could very well be due to a problem in the alternator. There may be a shorted blocking diode inside it that is there to prevent this kind of thing from happening. It would still let the alternator work like it should but draw current while it is off. Here is a link that may help you with this problem.

http://www.aa1car.com/library/battery_runs_down.htm
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