Rain kills my battery

[dweymer]

My car is normally in a garage or trailer, but has been outside for a few reasons. It rained a lot last night and I water on the floor. My battery was dead & I mean dead, dead.

Wouldn't a short like that heat the wires enough to start a fire?

What could it be?

Waiting on the charger so I can go to VIR this weekend

[911pcars]

They may be separate and unrelated items. Does the battery discharge overnight only if it rains?

If there's even a smallish current drain in the system (e.g. bulb left ON), it doesn't take but an overnight stretch of time to discharge a good battery; much less time on a borderline battery.

There are ways of checking the battery and/or the electrical system. Do a search using the terms "parasitic current drain" or "battery discharge".

Sherwood

[dweymer]

only when it rains

[911pcars]

Just a guess. I'd try to keep the top of the battery dry. Water and traces of acid on the top may create a temporary current path from + to – posts.

.....or disconnect the battery ground cable next time and see if the battery still discharges due to some electrical circuit issue when wet.

Sherwood

[dweymer]

Just got back from buying a disconnect for it