Truck Repair: tail & running lights, ford f350, running light

Question
i have a 2002 ford f350 my tail lights and running light stoped working.the brakes and the blinker lights work fine.the fuze looks good.plz help me i'm stumped.

Answer
Hello Norbert,
First check for power at that fuse with a test light. Touch the little metal spot on the top of the fuse. Check both ends.
Or, just replace the fuse with a known good one, like one of the others from a system that is working...same size fuse.
If power is there, go to the wires and wiggle all the connections.
I would even unplug some connections and test with the light.

Van