On a 1981 Datsun 280ZX does anyone know the connections on the back of the altenator. I know there is a plug in connector and a connector to a buss terminal, but there is a third big black wire with a eye connector on it coming out of the same harness. Is that a ground and if it is does it also connect to the altenator? It was not connected on the old altenator. Thanks for your help.