my turn signals all the way around and brake light on my 94 7.3 are not working. I have tried changing the signal flasher and changed all of the light bulbs, also have checked all fuses. My question is could my turn signal switch be bad? Oh i have also changed the little brake light switch button on the brake pedal. Would the brake lights run through the turn signal switch too? There is a lot of play in the the switch its self!

 

I had a similar issue, how do your body grounds look? I replaced mine and added a few and everything work fine now, though I still need to replace the turn signal switch because the internal catch is worn out.

 

My friend just had this happen with his 94 lost his all turn signals and brake lights and it turned out being his turn-signal switch. so could very well be your problem