20 year parked NO HEAD LIGHTS HELP

Head light ONLY power (not tail, park or dash lights) goes TO the light switch via a heavy wire coming from one of the fuse links in the engine bay, a no 12 black wire going through cavity 16 of the bulkhead connector. Check that you have power there first

TS first thing I'd do is find the TS flasher and check for power (key on) at the flasher, and if you have it, replace the flasher

You have a shop manual? Wiring diagram?