tail light making me crazy

I would check it at the 8 cavity plug connector at the base of the column, should be a dark green wire (most Chryslers use that color ) for the left side , the brake and turn signal use the same wire for the left rear .
As 67Dart273 suggested to use a factory wiring diagram to check your year/model for that circuit.
If it doesn't have a signal there then you have a bad turn signal switch.
If it does you need to work your way back from there and find the bad connector or wire.