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Old December 7th, 2006, 09:49 PM   #1
lgottler
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Default Suburban Electric Drain?

OK, another burb problem.

1994 Suburban. Constantly having dead batteries. Figured it was the aftermarket alarm system on it (it was going off for no reason), so I had a shop tear all of it out 2 weeks ago. Probably damaged the battery some because it died at least 10 times since I've had it and no idea how long its been going on before I owned it.

Leave it sit for 3+ days and its dead.

What I've done: Monday night, when I wasn't sick yet, I inspected the terminals and replaced a too long bolt on the side post that prevented the terminal from being tight. Today, my father came over and hooked up the battery to a charger for me while I slept, still sick damnit! Tonight, I tested for the problem, hooked up a test light between the positive post and the starter cable and proceded to unplug fuses until the light went out.

I have an override on my dome lights that lets me shut them off, but anyways, the light went out when I pulled the fuse for the courtesy lights.
So, any idea how a courtesy light can cause a short that won't blow a fuse, but yet every light works on the inside just fine?

I just got back from testing the batt, they said it was junk, so I bought a new one and just left the fuse unplugged for the courtesy lights until I can track that down....

Any tips?

Lucas
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Old December 8th, 2006, 10:16 AM   #2
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Glove box light or ash tray light staying on?
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Old December 8th, 2006, 11:38 AM   #3
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glove box light, underhood light...
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Old December 9th, 2006, 04:13 PM   #4
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I need a real manual. This Haynes says that only the inside lights run off the fuse I pulled, but my radio is also gone.

Now I've got a trans line leak. When it rains it pours.

Lucas
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Old December 11th, 2006, 07:33 PM   #5
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Periodically the door switches go bad and while they don't let enough current to go through to light things up it is enough to drain a battery.

I recommend getting an ammeter and testing that circuit.
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Old December 18th, 2006, 09:58 PM   #6
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Well, I hooked up my little test light and tried to see what I could do as far as courtesy lights. I unplugged damn near everything with a light bulb. Still nothing. I switched on and off every light, wiggled the switches, the wires, etc... I can tell when something goes on too, the light just gets brighter, like when I lift the hood too high and kick the underhood light on, the test light goes really bright.

Its a hefty drain too, the test light is on pretty damn bright. Kinda like an interior light bright.

I tore out the CD changer for the hell of it. Me and the wife would leave it on overnight accidentally and the unit never would shut off. It just kept playing and playing, switching CD's until you shut it off. You couldn't read the display either, so its basically junk. But that didn't change anything.

Glove box light is good, switch works, vanity lights seem to do their thing.
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Old December 19th, 2006, 10:29 AM   #7
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Put your meter inline with the battery and then start pulling fuses. WHen the meter drops to zero (or drops substainally) this would at least give you what circuit is causing the drain. You need to approuch this systematically.

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Old December 19th, 2006, 11:21 AM   #8
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Thats what I did. Its in the Courtesy Light circuit.

Lucas
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