"Time" for some "understanding" LOL
Start by going to MyMopar.com and download a free service manual the closest you can get for your car. Some years over there you must sub Dodge for Plymouth and vise versa. Also download the aftermarket wiring diagrams there. These are somewhat easier to read, sometimes, but are NOT always correct/ complete
NOW...........
1....The ignition switch has NOTHING to do with ANY lights except the oil and brake warning lamps
2....The light switch has TWO separate power sources, look at the diagram.
B1.......is batt for ONLY the headlights and comes from the big splice in the black ammeter wire up under the dash. It is rare, but these can fail
B2......receives power from the TAIL fuse and provides power to the tail, park, and dash circuit. The dash lamps have a separate fuse that comes AFTER the dash dimmer control and feeds off then to the cluster lamps.
PLEASE READ this article which has a simplified diagram of main power distro:
Catalog
Follow along below on the simplified power distro:
This is the "functional path," not electron flow. Power from battery goes through the fuse link and through the bulkhead connector on the large RED to the AMMETER THIS IS HOT AT ALL TIMES AND IS NOT FUSE PROTECTED EXCEPT THE FUSE LINK, which is "damn poor" protection
From the AMMETER out on the BLACK ammeter lead a "few inches" to the WELDED SPLICE. This branches off and feeds (depending on year/ model)
HEADLIGHT SWITCH
IGNITION SWITCH
FUSE PANEL HOT BUSS
and maybe something else on some years
View attachment 1715091287
HOW TO TROUBLESHOOT
Start by downloading the manual. Find the fuse panel layout in the electrical section (8). Check for power on the tail circuit fuse which should be hot at all times. Not all fuses are hot unless the ignition switch is on.
Turn the switch on to "head" and access the floor dimmer switch. One terminal should be hot, and the other two should "switch" from power to no power as you cycle the switch.
DOES THE BRIGHT INDICATOR on the dash work?