When i use turn signals the flashers in the dashboard dont light up, and only the rear driver side blinker flashes faintly. how do i get all of them to work?

ck fuse for rear taillights tis under the dash lower left of steering wheel. or if you still have the manual look in there under fuses.
also look for a bad ground but i doubt that.. if it's both rear out.
fast flashing well here's a chart with all sorts of info.
Problem What To Do Turn signals light, but do not flash Replace the flasher No turn signals light on either side Check the fuse. Replace if defective.
Check the flasher by substitution.
Check for open circuit, short circuit or poor ground. Both turn signals on one side don't work Check for bad bulbs.
Check for bad ground In both housings. One turn signal light on one side doesn't work Check and/or replace bulb.
Check for corrosion in socket. Clean contacts.
Check for poor ground at socket. Turn signal flashes too fast or too slow Check any bulb on the side flashing too fast. A heavy-duty bulb is probably installed In place of a regular bulb
Check the bulb flashing too slow. A standard bulb was probably installed in place of a heavy-duty bulb
Check for loose connections or corrosion at the bulb socket Indicator lights don't work in either direction Check If the turn signals are working
Check the dash indicator lights
Check the flasher by substitution One Indicator light doesn't light On systems with 1 dash indicator:
- See if the lights work on the same side. Often the filaments have been reversed In systems combining stoplights with taillights and turn signals
- Check the flasher by substitution On systems with 2 Indicators:
- Check the bulbs on the same side
- Check the indicator light bulb
- Check the flasher by substitution
hope this helps. may want to print for future reference. :)
hope this helps.

You have some burned out filaments. On dual filament bulbs the "blinkers" I am taking it to mean the turn signals. They are one filament. The "Flashing Caution lights, work on a relay circuit, which sends a larger amp current into the opposite filament then the turn signal. Check front & rear bulbs.

If both front & rear lights light up but dont flash the turn signal flasher is bad. Verify all bulbs are lit, on both sides of vehicle front & rear.

If the lights come on but just do not flash, replace the flasher relay. Your Thunderbird has 2 flasher relays. One for the Turn signals and one for the Hazard lights. The turn signal relay is located Front seating area, driver side, under dash, driver side of steering column, mounted in lower corner of fuse block . The hazard relay is located Front seating area, driver side, under dash, driver side of steering column, mounted in rear of fuse block. Replace the one for the Turn Signals. Information Curtorsey Auto Zone.

NO PROBLEM TURN ON THE RIGHT BLINKER THEN WALK AROUND THE CAR MAKE SURE FRONT AND REAR BULBS ARE FLASHING... IF YOU HAVE A BULB OUT YOU WILL NOT OFFER ENOUGH OF A LOAD TO THE FLASHER... WILL CAUSE IT TO FLASH FAST... IF OK THEN MAKE SURE THE PROPER BULB NUMBER ON BULBS AND MAKE SURE CORRECT BULBS USED IN VEHICLE.... IF OK CHANGE FLASHER

its your blinker box.. all major lights run through there

No Turn Signal Operation (blinker)The turn signal lights in your car are a basic electrical system that controls the front and rear blinker lights to alert the intended direction of the vehicle. We have listed some of the most common problems and repair troubleshooting tips below:
Troubleshooting Procedure
To start troubleshooting this problem:

• Turn the key to the on position (do not start engine)
  
• Inspect the system fuse located in the fuse panel and replace if needed. If you cannot find the location of the blinker fuse consult your owner's manual or an online repair manual
  
• When a blinker flasher fails it can cause blinker lights to say on, not blink, or not go on at all. To test the blinker system flasher, remove the flasher unit and insert a jumper wire between the two terminals. If blinker stays on in both directions without blinking, replace the flasher. If you cannot find the location of the blinker flasher consult your owners manual or an online repair manual.
• 
  

If ALL Wiring in Trunk is Good Then Its The SWITCH = Multifunction Switch<<

TURN SIGNALS WILL FEED BACK THROUGH THE TURN SIGNAL SWITCH.THEY ARE INDEPENDENT OUT SIDE ON THE CAR BUT NOT IN THE SIGNAL SWITCH.REPLACE THE SIGNAL SWITCH

sounds like a ground problem. check your blinker ground connections