Pretty odd...no tail/parking lights or gauge lights?
Headlights work....brake lights work when pedal pushed.
Only thing that has been changed is the stock AM radio to a more modern looking radio.
I remember when I hooked it up the orange wire I just left off and put a wire nut on the end of it does that need to connect to something because I tried putting 12 volts to it and nothing happened but it did spark.
The dimmer switch seems to be working because you can turn it all the way left and the dome light will come on.
Any help is appreciated