pogieeh

Vehicle behind me told me that one of my brake lights are not functioning. I tested it and I confirmed that left side is not working. Could it be that the turn signal is faulty. Also the left turn signal is in rapid mode. Your response is greatly appreciated.

FTADVB

Try changeing the bulb

jrmongi

X2 on the bulb

BkoJoe

tested it how? no voltage to the assy? do you have the right bulb in it, have you recently done anything to them?

Hwy101_Ranger

i just fixed the socket for my tail lights. idk if it is for you, or what year your truck is. but i kno pre 80 trucks the sockets go bad. ive changed both reverse light sockets and Left brake/turn socket. if the problem pursists after changing the bulbs.