1980 Ramcharger (360) electrical outage 2nd question/comment

That must be the charge/discharge indicator integrated into the dash cluster. Assume must remove that whole unit? How do you test; continuity? And, is this a ground wire attachment or hot? Thanks.

Thank you. I removed the instrument cluster. There was a large black wire and large red wire attachment. No power to each. Both tested as a ground (12v tester from wire terminal to (+) battery terminal/ no circuit when tested with (-) battery terminal).. Attaching the two together made no difference. The problem must be before the gauge. If one should be (+), then why both negative?

Thanks. will check it out. Seems curious that the two wires at the ammeter both test ground. Will energize the black wire to see if it's "downstream" components work.

It is fixed. Ultimately, there was a burned wire prior to the fusable link that had to be repaired. It was hidden in electrical tape wrap and was exposed when tracing. Thanks for your help. deeply appreciated