The negative terminal clamp on my GF's Altima needed to be replaced. So I put on a new clamp but in order to have the extra slack I disconnected the cable to where it is attached to the body but it also looked like a ground , however after it is attached to the body it is grounded on the engine by the same cable. So my question is where its attached to the body really a ground? or just there to keep the cable tight in the engine bay. The car runs fine with the cable just running to the engine.