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Have 2010 f350 SD v10 with 9k miles. The other day right rear turn/brake lamp stopped working.The next day they worked then it quit again. All others working. When emergency flashers are on still no light. Checked and replaced bulb.Nothing. Where to look next and where the hell is the flasher module/relay. Looked under dash, could hear it cant see it.
There is no flasher module/relay anymore. Everything is in the turn signal switch and a relay buried in the dash behind the radio. Take it in under your warranty.
doberman1, did you ever figure out the cause of your turn signal problem? I have a 2009 F450 with the same problem.
There was a short in the wiring harness between the fuel tank and the frame. The dealer had to drop the tank to get to the harness. It was covered under warranty!!!