If you are refering to the rear, check the ground wire behind tail light. Also check your flasher, bad one will let one side work and not the other. If these dont work, get a test light and check for power. Starting with tail light and work towards turnsignal switch.
it could be your brake light switch,or the fuse could be blown ,or the bulbs could be blown.or it could also be the turn signal switch.
If the turn signal is working it's either the brake light switch or the turn signal switch.
It could be the ground wire, the brake light switch, a damaged wire or connector or the turn signal switch.
The brake light switch, or turn signal assembly (dependent on how your system is wired, IE: that year of car).
Check turn signal switch. Pull back lighty on turn signal lever and brake lights will come on. Replace switch inside steering column. The green and yellow wires you see at the bulbs are the ones that control the brake lights and turn signals.
Either bulbs or possibly the turn signal switch. the bulb are blown have them change
First, check all fuses. Then see if you are getting power to the bulbs. Then the next possibility would be the turn signal switch.
Bad bulb socket? Broken Wire to socket?
Problem may be in the steering column turn signal not cancelling completely - try "jiggling" stalk and have assistant watch brake light
A defective brake light switch could cause the problem. Also a defective turn signal switch could also. The brake lights work through the turn signals. It cancels the brake light so that the turn signal can work.
You almost certainly have bulbs burnt out. Answer 2: Check the fuses, as well as the bulbs. If all that is good AND your system uses the same light (Brake Light) for the turn signal, then check the turn signal switch as well (the brake light lead passes through the turn signal switch). If that is all good, or it is a different system, then check the wire leads running into the rear section; most have plugs that could have become disconnected.
it maybe the brake switch