Check the fusebox on top of the battery. The alternator cable runs there to a strip fuse, which runs to the battery. When alternators fail, they overheat the cable/fuse which melts the contacts in this fusebox. This is a very, very, very common problem on mk4 jetta/golfs. If you pop the fuse cover off, you will immediately see if it's burnt or not. You'll see melted plastic, white "chalk" marks everywhere, etc.
You should replace the fusebox, all the fuses, and the alternator cable.
Sunday, May 13th, 2012 AT 3:26 PM