Headlights won't turn on!
............ dome lamp will work but no headlights or gauge lights. The gauge lights could just have some old bulbs ............ My parking lamps work but I know that circuit goes thru with turn signals and flashers cuz they both work ( turn signals,flashers). ..............!
Stop guessing and figure out the system
..............Go to MyMopar and download a service manual. also there, are aftermarket, simplified wiring diagrams which are sometimes easier to follow
http://www.mymopar.com/index.php?pid=31
You also need some tools, a test lamp, a multimeter, and some alligator clip leads
There are TWO power sources to the light switch.
Park / tail / instrument lamps power comes from the TAIL fuse.
Power TO the instrument lamps goes from TAIL fuse, through the switch and dimmer, and BACK OUT to the "inst" fuse in the fuse panel, which is all the way to one end of the panel.
HEADLIGHTS power comes from a big welded SPLICE in the black ammeter wire. This splice branches off from the ammeter wire, and feeds the ignition switch, the "hot" buss in the fuse panel, and the headlight switch.
"Probable" trouble areas............
Bad connection right at the headlight switch power or headlights "going out" from the switch
Bad connection at the dimmer switch or bad dimmer switch
Bad connection(s) at the bulkhead connector where the hi and lo beams go through. THIS WOULD AFFECT both high and low beams.
START by accessing the dimmer switch. Turn on the light switch, and probe the dimmer switch "for power." TWO of the terminals of the dimmer switch should be hot. When switching from hi to lo whatever terminal is dead should come hot.
Power FROM the light switch goes TO the dimmer and the dimmer selects one or the other and feeds either hi or lo on out through the BULKHEAD CONNECTOR.
If you have power at the dimmer switch, I would move on out to the headlights. Remove them, examine the harness GROUND point for the lights
Probe the back of the headlights connectors for power.