Its not the bulb i tried that but i have a headache rack with lights in it and it doesnt work either but the front and the side mirror work fine. The ground wire connection might be corroded. Running lines and trailer brakes work, but brake lights and turn signals do not. Re: Ford F150 Trailer Turn/Brake Lights Don't Work??? We tested the brake light switch, there's continuity when the brake is pressed. The switch is canceling the brake lights when it shouldn't. Oxygen sensor could that cause it to hesitate on a 93 F150? When truck is connected to two other of my trailers all lights work on both driver and passenger side. Blinker and brake lights quite working on a 1993 ford f150? 1996 F150 4X4 5.8L Auto Trans I have no turn signals or brake light except brake light on the top of the cab. What would cause my brake lights, tail lights and my rear turn signals to stop working on my 1998 Ford F150 XL pick up truck. Have had problems with the turn signals, brake lights, and windshield wipers on my 1999 Ford F-150. One of our readers writes that his brake light and the turn signal is not working on one side! Passenger side is working no reverse lights that I know of . Same issue . With NEW MFS and OEM flasher relay, the brake lights DO work, but the turn signals and hazards do not. Before I start tearing apart the dash to trace wires to the fuse block, Not working: Hazard flashers; Turn signals; Brake lights; However, head and tail lights both work when they're turned on. READ THIS Yep... Ford leaves a lot of things out of the owners manuals. The relay interrupts the signal before going to the light, allowing the light to flash on and off. Good Evening, I have 2009 Ford F-150 Lariat 4x4. Comment Same issue here. (Sometimes the a bad front light will prevent the rear from working.) The tail lights and the 3rd brake light are working but the rear brake lights, flasher and turn signals have stopped working. The right side light does not work – no brake light or turn signal. TO. A direction signal system is designed to operate with a flasher or blinker unit which interrupts the signal which created the blinking action. A broken wire to or from the switch may also cause the lower brake-lights not to work. My trucks been fiddled with here there and everywhere fro. The contact states that while driving, the right rear lights and turn signal failed to function. The third brake light does not flash with turn signals. You'll just need to patiently go through checking everything in … I have a 05 monte carlo, my problem is my turn signals are going crazy, they work just fine while the car is in park, after putting in gear they stop work, also when i turn my head lights on thats when they work but they blink real fast, last thing my fog lights are very dim, I've replaced and checked fuses and bulbs, still same issues, can someone help, Thans Randy I have replaced the brake pedal switch, turn signal switch, and the SJB and none of it fixed the issue. I have a 1997 F150 5.4L 2wd long bed w/ tow package. What’s the solution to this problem? We have changed the bulb but still nothing. Step 3 - When a turn signal flasher or relay fails the blinkers will not operate or come "ON", but not blink. (Same Bulb) All other lights are functioning properly. A friend of mine has a 2004 F150. Ford F-150 2000 4.6v8 s/cab 270000 miles. 2010 F150 My running lights and head lights work but my brake lights and turn signals do not 4 Answers. Try the signals in both directions. After swapping the turn signal switch in … I checked all the fuse's and they are fine.The multi function switch has given me some problem in the past when it is cold (below 20) (getting turn signal to work, turning right) but never affected the brake lights. The tail lights work, just the brake… The yellow wire (signal and brake) measures 0 Ohms went tested with jumper wire from trailer connector to light fixture. Signals and Brake lights are both operated on the high side of the tail lights, Bulbs or LEDs. The 1985 Ford F150 followed a similar setup to all Ford trucks and SUVs with regard to the turn signal. I would try a few simple things first. 1998 Ford F150 Regular Cab Replaced brake light switch. The tail light on the right side does illuminate when headlights are on. 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