I think I understand what you mean... on your wiring harness you should have several wires left over. A black, white and a green. The green should be your ground wire. All i did was go to lowe's and get a pigtal adapter (Just think of a lamp cord plugging into the wall without a lamp). Once you have that, you wire that to those leftover wire's. I would get one with a ground. Just ask the guy at lowe's and he should tell you how to hook it up.