73 C10 PU Dome Light & Fuse Question

[embers49]

I have a 1973 C10 3/4 (Cheyenne) PU.
Can anyone help me out with a few questions about the dome light.
It will not light (by door switches or headlight knob).
I have replaced the bulb and nothing. The bulb socket and housing are in good condition.

Is the dome on its own circuit/fuse and if so which one on the board is it?

Also, anyone know where the wires run for the dome.
If it isn't the fuse I'm guessing the circuit is broken but I don't know where it runs to trace it.
Where does it ground out?
My first guesses are fuse, ground is detached or broken wire but no clue where to look.