Either you have a broken wire, or blown fuse or you have a messed up blinker switch. The way those taillights work theres a white wire under dash on the column that white wire is for brake light. So the way the brake lights work they go through a relay and through blinker switch. So you could have a blown relay i would start there. 1 relay is on the back of the fuse panel, the other is next brake pedal on that panel to the left of the brake pedal. Try replacing those, and if that doesnt work look for broken wires under dash, and check all the fuses, replace blinker switch, and hazard switch. If all that doesnt fix it then you must have broken wires or bad grounds