electrical gremlins
This sounds like the fuse link/ bulkhead connector/ ammeter wiring
This article is about these problems, but we really just want the diagram for now
Catalog
Simplified diagram of your main primary power
From the starter relay, goes through the fuseable link, through the bulkhead connector, through the ammeter, and to the BLACK ammeter wire. At some point under the dash harness, the black has a WELDED SPLICE which distributes power as shown to headlights, ignition switch, etc
I would start right there at the fuseable link and bulkhead connector and go next to the ammeter
This sounds like the fuse link/ bulkhead connector/ ammeter wiring
This article is about these problems, but we really just want the diagram for now
Catalog
Simplified diagram of your main primary power
From the starter relay, goes through the fuseable link, through the bulkhead connector, through the ammeter, and to the BLACK ammeter wire. At some point under the dash harness, the black has a WELDED SPLICE which distributes power as shown to headlights, ignition switch, etc
I would start right there at the fuseable link and bulkhead connector and go next to the ammeter
