No, harness is new with the black spiral tape on it. Melted the insulation off entire wire, but only ran for a few seconds, so other wires under the tape were not damaged. Will look at the alternator and see if the field grounded. When we checked the terminal on the regulator, it was grounded. Not sure if it’s a point type regulator or the a replacement electronic version. Will try disconnecting the regulator and see if the field is grounded.