My turnsignals do not work. Also the flashers and the back brake lights do not work. The upper deck brake light does work. The bulbs are not blown. No fuses are blown. Replaced the round relay for the turn signals but they still do not work.

Do you have brake and parkng lights? The turnsignal switch on the column is just designed to relay a path to the flasher and then it is designed to interupt the brake and some of the parking lights lights, which cause the flashing on and off. Double check fuses double check bulb socks and bulbs for good contacts. Does the 4 ways work? If the lights all flash then locate the turn signal flasher and switch with emergency flasher if possible to rule out relay. If those are all good and the emergency flasher lights work and bulbs, then you would have a problem with the turn signal switch. Hope this all helps

Suspect the multi-function switch. (turnsignal) these fail a lot.

sounds like a real delema, I would check all fuses first, see how it is . then check wiring @ rear for corrosion, bad connection, etc., inspect closly, next, check all light bulbs, closely, anything yet ? Inspect your wires from back to front along frame rail, under vehicle, for corrosion, bad conn., etc., I'm thinking maybe a main power wire or ground both very important, power to send, ground to send back, what goes around comes around, understand ? many people overlook the ground wire, without it you got nothing, like what you have , nothing !!!! NOW, all power starts @ the battery, so don't forget , those wires need inspection also. your turnsignal switch needs adressed also, in your steering column, and the headlight switch ! take one step @ a time, use patience, check items off as you go, do easiest first, fuses, wires, replace 4-way flasher, turnsignal flasher, get the idea ? you'll get it, keep it simple , cause it is !!!!!!!

replace brake light switch @ BRAKE PEDAL, next, replace turnsignal flasher under dash, check for blown fuse, if turn sig. still doesn't work, check turnsig., switch, & or for loose connection.

bulbs might look o.k. & still be blown, trust me get new bulbs anyway.

flasher relay is bad
or bad bulb

That is a little strange, but could be just bulbs have blown. Switch must be ok if high mount works, so check bulbs first. Unless there is a separate fuse you could check that too.

on chrysler products the third brake light is run independant of the body control module, try checking the fuses that run the brake lights and see if any are faulty if not check you have voltage at the switch and a signal getting to the lights.

If you have no third brake light it most likely the brake light switch.

Sounds like either a fuse or bad flasher. Do the the turnsignal lights  light up and stay on?