dimmer floor switch gets 3 wires, one input, light green, 2 outputs, red for highs and violet traced white for low beams. You need to turn on the lights and then check for power at green wire. If not, problem is on wiring or lights switch. If yes and no output on any of the other wires, dimmer switch went bad. If you get power on any of the outputs and still no power to headlights, problem is on wiring from dimmer switch up to headlights including bulkhead.
as mentioned, if you get power up to headlights ( no matter if red or violet ), the radiator core support ground could be something to check
Headlights switch gets two input sources, one from fuse box ( usually pink as far I recall ) and one just for the headlights which is black and comes directly from alternator/ammeter splice down the wiring tape. The plug uses to get melt out specially at black wire
