Voltage at Taillights 66 Dart?

Thanks, I think the switch might have just quit. The rheostat was a little hot before the head lights quit. Right now I have 12.50 volts on battery, 12.39 at the 12 gauge red in ignition switch plug, and 12.39 on the Black/White stripe wire from the welded splice to light switch. I will check your recommendations when it gets light out. Thanks