turn signal debacle

I am having turn signal issues with my truck. I have replaced all of the turn signal bulbs with new ones but only the driver's side rear signal is working. Any thoughts?

 

factory halogen bulbs? Have you checked the connector on the bulb? any burn marks or melting? Do the hazard lights work? Or only the 1 rear one?

 

No modifications were made to the truck as far as i can tell. I bought it about 5 years ago. There are no scorch marks on any of the connectors. The turn signal relay hyper clicks. The hazard lights do not hyper click but only the one left rear light flashes.

I hooked up a trailer to the truck and ALL of the lights work and flash properly on the trailer.

 

Fyi no LED lights are used.

 

Maybe I am not understanding but…

Why did you replace the bulbs to begin with? Were they blown?

If you replaced the bulbs simply as preventative maintenance you either installed the wrong bulbs or installed them incorrectly.

 

I replaced the turn signal bulbs because three of the four were not working. The front bulbs were definitely burned out. The rear ones i couldn't tell. But there was no change from before or after bulb replacement.