[bridkarl]

I was only referring to the black wire that goes from pin 1 of the Bakelite block to the center pin of the rectifier - which I referred to as the ground. As in the photo.

As I’m reading the schematic this completes the circuit for the pilot bulbs (55) - using a tap off the transformer 60 which - although unlabeled - appears to provide 6.3VAC

But as I said I’m fairly sure I don’t understand what I’m looking at so rather than continue to post uniformed comments I need to go quietly study this. This has been worked on before so I’m just trying to make sure the previous owner didn’t introduce any errors - hence my concern that the wire described above is going what I think it is - providing a ground connection at the pin to complete that 6.3VAC circuit.