Headlights work but nothing else?

[Moe6973]

So I have been restoring my 77 f250
Just starting to put it back together and checking all the bulbs etc. Headlight are the only thing that works.
Checked all fuses and all bulbs are good and the grounds look good anyone else run into this? I know these have pretty easy wiring but before I go buy a new headlight switch was just wondering if anyone else has had this problem.

 

[Fellro]

Check for power at the fuses as well. If they are powered yet no go, it can be the switch or even the plug. Often when trailers are wired on the older trucks they are hooked to the marker circuits that then adds the load of the trailer lights to that circuit which goes through the switch of course. If the load is too much, it can heat the connector at the switch.