THE REAR TURN SIGNAL AND HARZARD LIGHTS DON'T WORK ONLY THE FRONT ONES, THE FUSE ARE OKE AND THE BULBS ARE FINE TOO.

The flasher is under the dash.If you turn on the signal listen for it's location.Turn on your 4 way flasher and see if the left rear light is flashing.If it's not then replace the bulb.If it still does'nt work after replacing the bulb check if there is power to the socket. Use a probe light.If no power to the socket.There is a break in the wire or worse the signal switch may be the culprit

Hazards have a different flasher than the turn signals.
Make sure both front and rear turn signal bulbs are good. If one is burned out, that side might flash funny or not at all. If bulbs are good, then it could be the flasher.
Usually the turn signal flasher is a small module about an inch or two in size, and located near the fuses or it might be under the dash near the steering column hanging by a couple of wires. Pull it out, bring to a car parts place to get a replacement, and plug it back in.

Sounds like you lost the ground to the rear lights.

Check and replace the bulb first before you do anything else.

the switch controls both front and rear signal lights.the wires just T off in the harness to go both ways.you don`t say but are the rear bulbs ok.there is 2 filaments in the bulbs one for tail lights and one for signals/brake lights.so the brake lights work if so then the bulbs are good.if not then the bulbs may be the problem.it could also be a wire feed/ground problem that you will have to trace from the sockets back through the system with a test light checking for power and ground.

you need to check to see which bulbs don`t work both front and back lights for the signal on the side it`s not working,you don`t say if any signals work or not if no signals work then you need to check the fuses under the dash on the driver`s side.now if it`s just one side then check the lights as mentioned above.if one isn`t then replace the bulb.if neither bulb is working then it sounds like the signal flasher is not working.turn on the hazard flashers and check the lights front and back.if all bulbs work then leave the hazards on and look under the dash for the flasher that is making the noise,this will show what the signal flasher will look like,then find the signal flasher on the fuse panel under the dash it should be located on the fuse panel.and replace

Have fitted the proper bulbs some have a staggered pin on them only go in one way

the fuse is broke

you replaced the bulb with the wrong one i.e. a two filament bulb with a one filament bulb

usually if the front are working then the rear should be too. check your light bulbs. if you tow stuff, check the wiring harness on the hitch.