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.
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