74 Cuda with stock wiring. Low beams work but when I hit the high beams I have no headlights. Replaced the foot dimmer switch with a rockauto (maybe Dorman) replacement but no change at all. The high beam dash indicator light goes on, but the headlights don't. This is a nice, triple black never rusty Texas car but it's a driver so the only new electrical items are a new rear light harness, a new backup light and under dash reverse indicator harness for the four speed, and a new voltage regulator with a dedicated ground back to the battery. I have stock cuda horns but they are weak so I think I may need the harness for the forward lights (which I think includes the horns).
Any insight on the immediate problem, and any thoughts on whether to just buy all the stock harnesses (at a premium price)? I like the idea of just starting with the dash harness and fuse panel and going from there with the appropriate harnesses. I know some modern technology, and bypassing the ammeter, are the "right" way if you're replacing everything, but I am willing to spend a little more so that everything matches the original wiring diagrams. BTW, I have a classiccarwiring.com wiring diagram and it's very helpful (not a plug just a fact from a wiring neophyte).
Any help would be appreciated, and if you are local you can come and fix it while I watch and drink beer.