barracuda gran coupe and se challenger wiring?
 

Hey members in need of your help in figuring out my overhead consolette light wiring on a rallye dash gran coupe barracuda? My questions are everything seems to be hooked up properly but I have no power going to the door ajar switches that are near the door striker?The front pins work because the map light and dome light works when the door opens.
1- How does the seat belt warning light work on a 70 gran coupe or se challenger I know this much when the ignition is turned on the overhead console fasten seat belt should come on and turn off after 10 or 20 seconds is there a relay if so where should it be located??
2 -should I have power to the door switches that are near the door striker like the front door switches have?
3-how may I tell if the low fuel relay is bad?
Any feedback is greatly appreciated!! Thanks Rob