does the front marker lights turn on too???

what about the rears???

if the fronts do and the rears not- then the wiring is reversed in the turn signal switch from front to back!

normally when brake is turned on- only power to the rear lights are on- front and dash signals are not part of the brake circuit.

so if your not using a factory mopar harness or someone has been monkeying around by resplicing the wires- you have a problem. first double check the wiring at the turn signal switch to make sure nothing is changed.
also make sure the tail lights are both grounded good!!!

my