84 c10 headlight conversion problem

[b1v3r]

I have a similar problem with my basic stock 85 CK10. Dash lights do not work except the heater control, turn indicators are dimly lit, brite lite indicator is lit on low beams but go off with hi beams. All exterior lights work, including turn signals and backup lights. Fuses are good. Everything was fine until about two months ago, then this all started happening. Truck runs like a new one so I want to keep it. I did run an extra ground from flasher/fuse box to dash metal for ground, but no help. Any help?