Dash Lights Problem! Help!

The resistor stack for the fan speeds is mounted in the plenum. Wires go from fan switch to resistor connecter.
So that little round piece has to be either part of the time delay on your interior lamps, or that seatbelt interlock. Heres an idea.. just unplug it.
I dont know all I'd like to know about how these odd features work since I haven't owned a 74. I do know dome lamp positive wires are yellow and hot wires are pink so I suspect that piece is time delay relay but I cant be sure.
Agreed we will take all the input we can get.