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A question about battery drain.

I was in a small fender-bender in the parking lot a few days ago, that practically tore of the front fender. There was no fluid leakage, however, so I drove it home after going through the accident report formalities. (I have a 1998 SL2 4 door.) The next day I had a doctor's appointment so after duct taping the fender sort of back in place I tried to start the car, but the battery was completely dead. I mean, dead as a doornail.

Now, it was raining fairly hard the night before and all that day and I figured that the rain must have shorted some exposed wiring. The shop did some testing that indicated there was no drain on the battery, so they concluded I must've left the light on or something. When I parked the car, however, after the accident, the sun was shining brightly so there'd have been no reason to turn on the light. Moreover, as I recall there's an automatic shut off if you turn off the key and leave the lights on. This mechanic tells me that isn't true, and that if you leave the lights on the battery will just drain. (All the doors were shut tight, by the way.)

So, I'm thinking that:

  1. The fellow is wrong about the automatic shut off, because that's one of the features I liked about the car.

  1. If they didn't test the car "wet" then how would they know whether there was a drain on the battery system from exposed wiring that shorted due to water?

What do you think? Am I on any solid ground here?

Reply to
Freewheeling
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It's likely he's wrong. But that's a moot point.

Did the battery charge up and work OK after you found it wouldn't start the car?

My thought on the exposed wiring...

There should be no current to those wires to "short out" whether wet or not. The switch inside controls when there is current to the wiring for the lights and that may work through a relay which will certainly be inside the engine compartment or another secure place.

I'd be looking for some other source for the problem.

Best, wes

Reply to
Dooger

Wes:

Thanks. The battery charged, or at least it charged enough that I could turn the key off and then restart. I'm virtually certain I didn't leave the lights on, and the doors were shut tight and locked. I have noticed, in the past, that sometimes the key wouldn't turn over the motor, so I'd leave the car in gear and rock it a little, then take it out of gear and the ignition worked fine. But there was no battery drain. The ignition switch was just finicky, and they checked the alternator anyway as part of their diagnostics.

Frankly, that's the least of my problems at this point. But I was curious why the battery might drain after a collision. If they checked for, and couldn't find, a drain on the battery then the rain must've had something to do with it. Either that, or I'm mistaken about the lights being on. But if there's a timed shut-off switch for the lights then that leaves some rain-related/collision-related problem, or at least rain-related/something-related, so the question about the shut-off switch wasn't quite moot.

Reply to
Freewheeling

Parasitic draw test and Load test. Not much else you can check for at this point.

Reply to
BläBlä

Assuming the rain has stopped...maybe whatever else may have caused the battery to drain stopped for a while too. I'm sorry but the chances that rain caused your battery problem is slim to nil...and slim just bought a ticket out of town. Do this sometime...take a charged up battery and hook wires to each post and then lay the other ends in a puddle of rain water overnight.

You already said the battery/starting system has been flaky in the past. That's where I'd look first.

Things are not always either/or.

Not necessarily.

Sure it was. If the wires aren't energized they can't "short" out. And rain water isn't going to cause enough current to pass between bared wires or "something" to affect the battery much one way or the other. So unless you left the lights on and there wasn't a safety shutoff switch there could have been no "short" in the wires. Distilled water is a very poor conductor and rain is pretty much distilled water.

Best, wes

Reply to
Dooger

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