96 International 4700 hazard lights wont work on the bed

I know that I don't have power where the wires come through the firewall before they run down the frame to the back of the truck. Are you saying to check for power inside the main harness under the dash?

I read on another post about a similar situation on this site about a diode somewhere that was their problem. Any idea where this would be or how to check? http://www.justanswer.com/heavy-equipment/4qlw6-1995-8200-international-hazard-lights-not-working-back.html

With the new switch, testing wires at the switch with hazards I have power at orange blue and black. With left turn I have orange yellow black right turn I have green blue and black. The only other large gauge wire that is left is red and it never shows it has power. Do you think I should try another switch? Do you have a diagram for these switches to say what wire feeds what?

This is at the back of the multi function switch in the steering column. So I will not have brake or tail light wires at this point. I have yellow blue red orange green and black on large gauge and then a lot of small wires I am assuming for wipers and horn.

I was waiting for a new switch to come in. It finally came into the dealer yesterday. I took the truck to the dealer so I could try it there and save a trip. Put the new switch in and same response (No hazards) ended up having to go to the service department. Talking to a tech he grabbed a small harness and said go try this. It was the harness with the diodes in it that I had mentioned above. They are not part of the turn signal switch it is an additional jumper harness that goes between the turn signal switch harness and the truck harness. This took care of the problem.