I have a 2011 f150 xlt 4x4. My left hand turn signals are flashing fast. I have checked all the bulbs on the left side and did find that my left peanut marker bulb was burned out and I replaced it. The signals still flash fast. I disconnected the battery and that didn't help. Any suggestions?

Thank you, Aaron

 

mine is doing the same exact thing but I have no clue what it is.

 

I just figured it out. I should of changed both left hand taillight bulbs. I thought they where all working, but I waited until the sun went down a little. I had changed the upper bulb on the left taillight but the lower park light was out on the left taillight. Hope you figure yours out as well!! Good luck.

 

Keep in mind these bulbs are two stage. One for running lights, and a second for brake lights. So double check they're all working for both running and brake lights.