electrical problem
#11
#12
Trace your wire for the lows back to the bulkhead connector. If it's intact it may just be a corroded connection at the bulkhead.
http://www.mymopar.com/downloads/1972/72SatelliteA.JPG
http://www.mymopar.com/downloads/1972/72SatelliteA.JPG
#13
There is a website that caters to Mopar B bodies that should be able to help you:
www.forbbodiesonly.com
www.forbbodiesonly.com