1 fault light working

Okay I have a 04 tacoma put new tail lights in it and got led red bulbs 1 tail light works the other doesn’t but both brake lights work. Even tried to plug the stock lights back up and it’s not working either. Fuses are fine.

 

Could be that the wire to the taillight contact has broken off its pin and you're not getting any voltage to that contact. If you have a voltmeter, you could check each contact inside the socket while somebody turns the lights on. First take the bulb out of the socket when doing this. You should see 12 volts when the lights are on, and nothing when the lights are off.