M3 electrical shorts out!!
so i have a 2002 bmw me convertible. when i have the battery plugged and turn the key i have power; lights, radio, seats etc. however as soon as i try and turn the key to start the car i loose all power. then i have to go unconnect the battery and plug it back in. then i'm back to square one. i've read some places that its the terminal connector wire any thoughts??