Signal light bulb change/who and where

Connectors in the socket might be at fault. Hold the bulb to one side and the other to verify.

the bulb assembly may have a short in it. when you replace the bulb in the left side,try applying bulb grease to the bulb itself. this way,the connection to the left bulbs not losing connection.this will assist you in replacing all of your bulbs in the future. add bulb grease. thank you for choosing fixya.com

best way is to undo the screws that bolt the inner wheel splash sheild from the bumper bar and bend it back enough to gain access to the bulb holder.

Maybe a relay or fuse is bad or the wiring to it.

But you said that the third brake light works.

So the brake switch must be ok.
Turn signals would be the flasher or wiring to it.
CIRCUIT PROTECTION Fuse Block Fig. 1: The fuse box is located under a cover at the lower left instrument panel — 1987 Voyager shown
The fuse block and relay bank is located on the driver's side under the lower instrument panel. The fuse block contains fuses for various circuits as well as circuit breakers, horn relay, ignition lamp thermal time delay, and the turn signal flasher. The hazard warning flasher is mounted into a bracket below the fuse block. The individual fuse and relay locations can be found in the wiring diagrams at the end of this section.
is bad.

you need to check the "combination turn signal/hazard flasher/daytime running lights module"
it is located in the junction block,the junction block is adjacent to and left of the steering column,you need to remove the lower dash panel below the steering column,then remove the steel knee brace.

Change the bulb on one and see what happens .R the parking lights coming on. R the 4 way flashers working

1. Unscrew the three screws that secure the headlight assembly to your Dodge Caravan. Put the screws in your pocket or another safe place, so you won't lose them before reinstalling the headlight assembly.
   
2. Pull the headlight assembly away from the front of the vehicle. Turn the bulb retaining ring counterclockwise to unlock the electrical connector. Remove the electrical connector from the bulb assembly by pulling it straight out.
   
3. Replace the old bulb with a new halogen headlight bulb. Connect the electrical connector and turn the bulb retaining ring clockwise to lock the bulb into place.
   
4. Reinstall the headlight assembly and secure the screws tightly before closing the hood. Turn on your Dodge Caravan, flip on the headlights and verify they're working properly.
   

burnt out bulb on drivers side.

the back bulb is out, replace it.

The problem is most likely not a bulb and certainly not a fuse but the 'flasher'. The flasher is located under the driver's side A/C duct above the fuse box. It just plugs in so you shouldn't need any tools.