Hi, my BMW has been off the road for awhile now. I was turning it over every week but forgot for sometime. So, I tried to jump it with the wifes car. I found the positve terminal at the top offside corner of the engine bay. Looking round I thought I had found the negative on top off the nearside turret, a thick black cable bolted onto turret.
Connected all up and went to try car. Dash light up then on turn over everything died.
I assume I had not found the negative.
What have I done?
Please, tell me I have just blown a fuse somewhere and haven't fried the thing brain.
Many thanks for any replies.