The running lights in your trailer is powered up from the truck side using the 7-way Trailer cable. The running lights do not work on my boat trailer. I did some troubleshooting on the trailer and found that the camera was shorted which took out the lights. The Ford Mechanic I'm going to connect you with knows all … I will check fuses JH5370, Nov 18, 2018 #8. Nov 18, 2018 at 12:32 PM #12 #12. Clip one end of a long jumper wire (Photo 2) to the connector pin and then clip the other end to the continuity tester. Can not get running lights to work on a trailer from 7 way round pin or the 4 way flat connection . power, back up lites, and brakes. Get your trailer hitch lights up and running again fast! :confused013: I go to hook up to leave campground yesterday and the trailer app light test said issue found with running lights, and my trailer running lights only don't work. Checked plug end and wires before plug and they have no power. Same story on two separate trailers. Trailer running/park lights not working, FUSES ARE GOOD!!!!! The marker and regular do not. Trailer Running Lights Not Working on 2010 Ford King Ranch. (I had towed the trailer a week earlier and the lights were fine.) 7 pin trailer running lights not working. The trailer running lights work just fine on my father's 16 Silverado so I know it's not the trailer. Rob371, Nov 18, 2018 #11. I know I not being much help but just trying. 700 miles on my travel trailer no issues. R your electric brakes working? Whats is working at 7 pin, L turn, R turn, stop, Aux. I have the factory tow package w/the 7 pin connector. Here's how to diagnose and fix utility and/or boat trailer wiring issues. Expert Reply: I found an online copy of the owners manual which shows there is a fuse and relay that protects the trailer running lamp circuit. I had this happen on a few occasions and just jiggled the plug and the running lights started working. Checked fuses on my truck they look good. None of the trailer ATC fuses would be involved with the DOT Safety lights on the trailer. If you are having a problem with your brakes on your trailer not lighting up while you're running lights are on here is a simple solution on how to fix that. when I hook it up, I have running lights and break lights, but no left turn. The 7 pin connector to my trailer. and right turn makes both lights blink. All of the running lights and one of the turn lights were no longer working. I've also seen where the trailer manufacturer switched the running light wire with the power brake wire. The wiring & plug are in good shape.... Log in or Sign up. The fuse that controls the running/park lights also does the trailer back up lights. The trailer lights work just not the running lights. ... 7 Pin Trailer Wiring; Running Lights Not Working. Nov 18, 2018 at 10:50 AM ... Just google the diagram for a 7 pin and use test light to check truck. I have not power going to the running lights for the plug. What I always do is use one of those 7-way test adapters to determine if the loss of 12VDC is on the trailer side or the truck side. ... No power on running lights 7 pin harness on 2010 Ford King Ranch Thanks, asked by: Louis T. 0. I have not power going to the running lights for the plug. Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix with a Ford. The blinker, flasher and brake lights do. Notice the two small screws outside of the broken 7-pin trailer cord socket: remove them along with theMeanwhile, with Kermit out of the office, Scooter is left to run the show andThe lighting does not turn on when I recieve notifications for either of these apps. Trailer lights not working? Not complicated. JH5370 [OP] likes this. All lights on truck work. Way flat connection turn, stop, Aux PM # 12 up, i have not power going to running! 'Ve also seen where the trailer back up lights when i hook it up, i not. 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