My car battery goes dead when it is wet outside, otherwise it is fine. What might cause this?

1999 CHEVROLET LUMINA
140 MILES
Avatar
KAFFAFFIE
  • MEMBER
  • 1 POST
Today it was raining/snowing and I went out after my car was sitting overnight and the car started...I drove to the store, about 10 minutes, shopped and the car battery was dead. After a jump start I let the car run for a while, went home (about 20 minutes running) turned off the car and it would not start again..any ideas?
Mar 3, 2012 at 9:39 PM
Advertisement
Avatar
CARADIODOC
  • ✓Experienced Mechanic
  • 34,367 POSTS
Start by measuring the battery voltage with the engine off and with it running. All you need is an inexpensive digital voltmeter. Harbor Freight Tools has them for $5.99 and often on sale for $2.99. Holler back with those numbers to at least one decimal point.
Mar 3, 2012 at 11:07 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.