[charleybrwn13]

Have you installed LED taillights?

Mine did the same thing after I installed LEDs. I bought a new flasher relay and haven't had any issues since. A new flasher relay may fix your problem even if you haven't installed LEDs on the rear.

 

[weins8]

no leds all stock...all light work always.....only signals when lights are on.....?

 

[KyleB1996]

Try and replace your turn signal bulbs or take one out and see of the turn signal works. I have had the same problem. Since the turn signals are all on one relay, if one bulb goes bad the whole circuit will not function properly.

 

[weins8]

the bulbs work fine ....just when the lights are on they dont

 

[Pmryall]

Replace your turn signal bulbs.

 

[IRQ]

Agree had problems with Wagoneer similar, one bad socket or bulb messes up the whole works. All the lights worked was the kicker.

 

[RahX]

One of the taillight bulbs is probably shorted to the turn signal portion of the bulb. If I had to bet, i'd say it was the bulb on the right in the rear. I would also bet when you turned on your right blinker without the headlights on it would do something weird with the taillights if you were watching them.