Try cleaning out the light sockets with a brillo pad or a wire bust ud be amazed at how just a little corrosion can mess things up

 

What you need to do is the plugs that are not working get a probe for a multimeter (Fluke 77/BN is one of the best) and check for continuity through out the circuit, could be you have a short to ground which will be easy to find out, but a pain to actually find the short itself. Rechceking fuses is going to get you no where they are either good or not. When you do this put a probe in the plug (or socket) and the other probe on the truck frame (or any clean metal surface) if you have continuity (ohms) then you have a short to ground. If you have an open (OL) then you are good to go on that particular leg of the wiring.

 

checked continuity and replaced multifunction switch still no joy guess my next step is re-wiring the brake/turn signal lights.
thanks for the replies