72 chevelle electrical problem

[Chevelle598bb]

Uhm , if that wire is completely grounded , like shorted to ground , wouldn't it melt ??? And need to be replaced ?

Yep. That's what I think has happened but you can't see the main feed wire if the harness is still in the car and wrapped up. I think the jacket on the wire melted and is shorting to other wire(s) in the harness. More than likely it and a few other wires will need to be replaced.