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Most likely its your turn signal switch. For some reason GM decided to run all the lights except headlights through it. You most likely don't have brakelights either. Sometimes you can verify by pushing a little forward or backwards pressure on the hazard switch and everything will start working.
I am just guessing at this one but you might want to check the headlight switch that turns on the headlights. Sounds like you changed just about everything else. The turn signals I believe are on a separate circuit from the brake lights. In addition you might want to check for a broken wire to turn signal harness
if your fuse is good. and you have power at the brake light switch and when you hit the brakes you have power coming out the otherside of brake light switch/which would be the white wire/ check that the white wire is sending power up the turn signal switch. if theres power there and your turnsignals work? im afraid that your turnsignal switch is bad rare but it has been known to happen.
I've worked on these the first drove me crazy. its the turn signal switch every thing runs thru these. head lights, turn signal, brakes. except the third brake light. it runs directly from the brake switch. go figuare
the multifunction switch is a common problem on fords. the switch controls the wipers, turn signals, high beams and hazards, and sometimes only 1 part of it will fail. in your case it sounds like 2 parts fail at the same time.