Well, much closer now. It seems the old relay switch must have died and the PO replaced it with a generic unit. The PO left the old relay in its rubber boot and must have just tucked the new relay in somewhere. I still have three wires (Grey, White and Black) of which Grey and Black seem to be correct.
Also the front turns were replaced with a two wire unit and I'm assuming the third wire was too the running lights. I can already see reassembling the wiring in the headlight can is going to be an all day, PINA.
BTW- I have a Clymer and it has a bunch of wiring diagrams, but only a 77 and 78 750F. Is there no special diagram for the 76 F? Which one is the closest, the 77 F or a K model?
I hope to turn the key tonight and have power!!