Re: installing a CD player... (rmankidy)
I don't know if you HAVE to disconnect the negative battery cable, but you better. You are creating an electrical hazard for yourself by not doing it. Plus, if you're putting in a VW cd player (no, you should not need the adaptor, so long as it is OEM to go in correct model year), your gonna lose your pre-sets anyway. Just dis-connect it. Save yourself a nasty shock.