Brake lights out

My brake lights are out and I can't figure out what is causing it. The third brake light on the cab still works fine. The stop fuse under the dash has been checked and is fine. The brake switch on the pedal is fine. Any ideas what could be causing the two brake lights on the rear fender to not work?

 

If the center high brake light works then the rear lights should also as they get power from the same place ( brake light switch ). So either you have Blown Bulbs or a wiring problem between the connector where the third brake light taps out separate from the rear lights. Or a grounding issue on both stop lights at the same time.

Check the bulbs, make sure they have a good ground connection then start wire tracing back from the stop lights with a voltmeter.