fuse box

Nilson767 said
What could I use to ground the wire?

Just about anything you can find. If you are going to work on these cars there's a few things you need.

A shop manual. A FACTORY shop manual. You can find reprints and "on CD" on ebay and around the www

A multimeter. You can buy these at auto stores, Sears, Radio shack and other places

Some clip leads. You can buy different sizes / lengths at Radio Shack

A 12 V test lamp, available at any auto store