yes redfish it does have a aftermarket radio in it,it also barely works took it out for its first long drive since i got it its gonna need some serious front end work also.
I'm fairly sure your instrument housing is plastic and has or had a ground wire.
I'm not sure if the dimmer reostat in in the headlight switch for that model.
I do know the stock radio had an orange wire for the light in its dial that was operated by the same circuit.
So... You'll need to check for power on the orange wires and look for a loose ground wire and or pinched wires at the fan switch since it is in the same area the aftermarket radio was shoved into.
Hope this helps