In some vehicles, the brake light switch is powered through a single circuit that also includes the turn signal light. The trailer and brake lights have stopped working. I tried a 7 pin to 4 pin adaptor and had the same results as just using the 4 pin. Turn signals, brake and hazard lights do not work on trailer. The signals work but I've got no brake lights or daytime running lights. Trailer Left Turn Signal And Brake Light Did Not Work. No trailer brake or turn signal on Ford, F250, 2011. Bulbs are good and even replaced. Fuses under dash check good. The right turn signal and brake work fine. We checked every fuse, tested with the test plug they had, and even changed the wire harness they provide with rental. Still doesn't work. The boat trailer has its own issue that I will need to sort out, but the 4Runner has an issue with the tail light circuit. The smaller ones click when the turn signals are on. Does anyone know if the brake/turn fuse for towing is in the same location on a 2011 pathfinder. If you don't have a flashing trailer with you turn signal, that side light on your trailer is not flashing too. 2011 F-150 Platinum. 9 Answers. If all the lights on the trailer work except for the brake lights, i.e. This will occur with or without the trailer connected. 03/07/2011 by mayer No trailer brake or turn signal on Ford, F250, 2011. When I take my electronic key and unlock the truck the driver rear lights will not light up but when I lock the doors it does light up in the back. Left rear blinker and brake light not working. Better safe than sorry. Checked all the fuses and they all seem good. Turn signals and brake lights don't work. Brake lights do not. Turn signals, brake and hazard lights do not work on trailer. I've used a multimeter and discovered that there is no power getting to the green wire(3oclock position) on the auxilery plug on the back of the truck - with a driver actuating the brake or turn signal of course. Dash reeds (trailer connected) when trailer is plugged up. I could maybe see just the signal not working, but the left brake should work if the right does. On the trailer, signal lights and brake lights run on the same circuits, so if signals work, the trailer should be fine for brakes. Bad ground at the light. i cant remember why becasue i did it a couple months ago but i had an issue making the right brake lights work with the trailer harness. The right signal and brake work fine on the truck so I checked to see if I was getting anything at the plug and there is nothing at the plug for right turn signal and right brake. right turn signal,and right brake light not working on my trailer. Found the running light tow fuse under the hood but cannot find a fuse for the towing brake/turn lights for anything. checked fuse in right kick panel ok, swapped relays under hood, relay good. also checked with new bulbs, any suggestions 6 … Every light works on the truck. We did check fuses. Blinks for left, nothing for right. Ford, F250, 2011. I had a shorted trailer give me the same problem. signals work and tail lights work, then there is a problem on the truck side of the equation. Running lights work, turn signals work, flashers work. I recently used a uhaul tow dolly and we could not get the brake or turn signals to work on dolly. Running lights work OK. Not assuming anything, if you have the light out anyway, check the ground. This only works when you have the Land Rover plug. There is now no power to the trailer plug for the right turn signal only, everything else is fine left turn signal works, right turn signal and right brake dont work on trailer only, works fine on truck. I verified this by testing the trailer harness under the cab with a test light. I also put and brand new plug on the truck side. I checked the fuses and they are fine as well. I just rewired trailer lights from scratch. All have continuity. The turn signals may still work properly, but the electric signal from the brake light switch passes through the turn signal switch (also called a combination switch) before it goes to the brake lights. All lights work on truck. Its not the trailer, I have tried multiple. Answer: Check both sides of the fuse and make sure power is going through. I Had No Idea There Were Fuse Under There. No blown fuses that state they have anything to do with the trailer when i connected both the directional and the brake light it would make a bridge in the connections and it screwed something up. If the blinker is working on the truck then fuse is good, this sounds like a bad bulb or connection to the light, the brake and signal use the same filement in the bulb. Factory towing package. I checked at the plug and get nothing from there except brake, charge, and running lights. I have tried several different trailers and they all have the same problem. This is not the case in every car, so check a wiring diagram to see if the wires go through the turn signal switch. My truck has lights that work as does my trailer. I assume you have no problem shifting out of park or you would have mentioned it, which tells me the brake light switch is functioning properly. The vehicle lights work perfectly fine. so i only have one brake light now. 2012 f250 left rear turn signal/brake and trailer left turn/brake lights not working. Factory installed tow controller. 9 Answers. I know there are 2 locations for … Question: I plugged a 7 way trailer connector in wrong and blew the turn signal fuse. Top brake light, turn signals, flashers, and taillights all work. Trailer brake and blinker on left side pin do not work either. One next to firewall has a large relay and two smaller ones. I noticed I had no right turn signal or right brake light on my camper today. Checked sockets with test light and turn signal seemed to be working, the tail lights seemed to be working, brake lights seem to be working. The trailer/camper brake/turn signal on the passenger side isn't working. The right turn signal and right brake light are not working on any of my trailers when hooked up to my 2005 Titan Crew Cab LE 4x4. The trailer wiring isn't the problem. When I got home I plugged my travel trailer and got the same results. I checked the bulb on the camper and it is fine. Hazards, Brakes, Running Lights, Turn Signals... Everything works on the trailer except the left side brake light. It is on a flat four pin wiring harness. It worked at first but at some point during the day the turn signals and brake lights quite working. ... You need to check the tow harness coming out of the BCM whick provides both turn signal and brake lights for the trailer. Trailer Left Turn Signal/left brake light not working. I have seen every light working on a trailer until you flipped on the turn signal and then every light on the trailer blinked. Now my lower brake lights do not work, but the fuse is good. I checked the trailer lights with my lights turned on and then with the hazard light and then individually with the signals, which all worked, but nothing with the brakes. found that trailer and bed have a different wire all the way to under hood fuse panel. The symptom for D1 or D2 failure is “crosstalk” between the vehicle Stop and Turn signal lights. checked fuse in right kick panel ok, swapped relays under hood, relay good. Wiring harness looks excellent everywhere. Checked bulbs all were ok. All lights work on truck. I get no power on left blinker trailer pin or in light socket on truck. I have replaced the bulbs and the connectors but to no avail. Dash reeds (trailer connected) when trailer is plugged up. The left turn signal and brake light are on the same wire, but only the left turn signal is working. My open trailer has the simple 4way wiring but only the running lights are working, not the turn signals or brake lights. 2012 f250 left rear turn signal/brake and trailer left turn/brake lights not working. Checked the harness where the kit plugs in and there's two spots that don't light up, everything else has power. When the right turn signal is on, no clicking. Everything works correctly on the truck (all three brake lights). could i be looking at a bad turn signal switch? Owners Manual Says Nothing About Them. Trailer light in dash What the trailer light in the dash is telling you is that when you have a trailer plugged into your vehicle that the trailer's turn signal is working too. One Of The Fuses Under The Steering Wheel Was Blown. So it's a bit confusing that both your left turn signal and brake light are not working. Trailer Brake and Turn Signals Not Working When 7-Way Connector Plugged into 2011 Ford F-150; Parts Needed to Add a 7-Way Trailer Connector to a 2008 Ford F-150; Running Lights Work But Brake Lights and Turn Signals Do Not Work on Coleman Camper; Trailer Lights Not Fully Working on a Trailer Towed by a 2007 Ford F-150 with Factory Tow Package thats what i thought too. It appears I have two issues. The left turn signal on my vehicle operates BOTH left and right turn signals very dimly for some reason. Tail lights don’t light at all when I turn on the headlights. The other box has two of the large relays. Try finding that one when you are hooked up ready to go and in a hurry. Have you checked this with the running lights off (headlights completely off?) The brake lights on my trailer are not working when hooked up to my vehicle, but the turn signals do work. They used a 4 pin to 7 pin adapter for their trailer. 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