PDA

View Full Version : Eletrical Problem after Battery Change


gupaiva
10-15-2008, 04:10 AM
Hi guys !!!

I've a 1998 328iA BMW and I bought a brand new battery for it yesterday.
When I was installing the battery, I made a mistake and put the positive side first. When I was clipping the negative side to the battery I got a kind of electrical short-circuit… Then the back windows of my car rolled down automatically and the signal lights also turned on automatically….

So… I don’t know what happens… When I try to start the car, nothing happens!!!

My car was 100% OK with the old battery before doing these steps....:cry:

Can y explain me what’s going on? Can I fix it by myself?

Thanks,
Gustavo

longress
10-15-2008, 07:48 PM
You may have fried the ECU. Reversing the polarity on a battery can send excessive current through the controller smoking the output drivers.