There should be a wiring diagram of this bike somewhere on this forum. If you can get it back to stock form, that would be a good place to start. It may be easier to find an old wiring harness, and trying to graft it in.
Glad we're able to help. I hope you get it running soon. Summer's just gettin' started.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.