There is a relay that runs the brake/turn signals. You may need to just replace this relay or possibly a fuse. but if the turn signals, brake lights and flashers are not working in the rear the relay is most likely the cause unless you have towed anything lately. I would also check the pigtail under the rear bumper for corrosion or looseness.
The brake lights and the rear turn signals should be the same bulb check the bulbs to make sure they are not blown does your third brake light work if all brake light are out and the bulbs are good check the brake light switch on the brake pedal
SOURCE: 1991 volvo tail lights
Could you take out a bulb and with a testlight/probe check that you do in fact have power to that circuit .Also check that they are the correct bulb for that application I have seen people put indicator bulbs in where therse supposed to be a double filament bulb.Does the base of the bulbs lead contacts line up with the two steel terminals inside the plug?
SOURCE: 2006 Chevy Trailblazer Tail Lights
There was a recall on this, take to the dealer and they will replace the whole socket on this.
SOURCE: Tail lights don't work on 1998 Chevy Silverado.
check the wiring from the tailights back to the fuse panel, it sounds like an open connection. if i recall correctly check under the dash on the drivers side near the fuse panel for a bunch of wires in a bundle and look carefully for a wire or two that are cut/shorted/or seperated, you can also check under the drivers side kick panel by the hood release.
SOURCE: 1999 jeep grand cherokee - brake lights and turn
The tail lights and the brake/turn lights use the same bulb but, there is 2 filamants in the bulb. One for tail lights and one for brake/turn lights. So just because the brake lights and turn signals work doesn't mean the bulbs are good. If bulbs are good you can check to see if there is power getting to the tail light assy's by unplugging the connector at the assy and using a test light probe the connector (harness side) with the headlights on. If you are getting power to the assy the test light will light. To make sure, turn off the headlights and test light will go off. Hope this is helpful. Good luck.
SOURCE: No brake lights, or no signal lights
brake lights and turn signals work off the same curcit, it could be the fuse or the brake light switch !!!!!!
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Have you checked your fuses to see if they are blown? Did it just happen or has this started occuring more frequently?
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