The Ford Mechanic I'm going to connect you with knows all … Get your trailer hitch lights up and running again fast! (I had towed the trailer a week earlier and the lights were fine.) :confused013: I have not power going to the running lights for the plug. I had this happen on a few occasions and just jiggled the plug and the running lights started working. Can not get running lights to work on a trailer from 7 way round pin or the 4 way flat connection . The trailer running lights work just fine on my father's 16 Silverado so I know it's not the trailer. I have not power going to the running lights for the plug. The wiring & plug are in good shape.... Log in or Sign up. 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. Whats is working at 7 pin, L turn, R turn, stop, Aux. Checked plug end and wires before plug and they have no power. Trailer lights not working? ... 7 Pin Trailer Wiring; Running Lights Not Working. All of the running lights and one of the turn lights were no longer working. power, back up lites, and brakes. All lights on truck work. 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. None of the trailer ATC fuses would be involved with the DOT Safety lights on the trailer. Here's how to diagnose and fix utility and/or boat trailer wiring issues. 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. The running lights do not work on my boat trailer. I know I not being much help but just trying. The running lights in your trailer is powered up from the truck side using the 7-way Trailer cable. Nov 18, 2018 at 10:50 AM ... Just google the diagram for a 7 pin and use test light to check truck. Nov 18, 2018 at 12:32 PM #12 #12. 700 miles on my travel trailer no issues. The marker and regular do not. I will check fuses JH5370, Nov 18, 2018 #8. I've also seen where the trailer manufacturer switched the running light wire with the power brake wire. 7 pin trailer running lights not working. The blinker, flasher and brake lights do. The trailer lights work just not the running lights. The fuse that controls the running/park lights also does the trailer back up lights. and right turn makes both lights blink. R your electric brakes working? Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix with a Ford. ... No power on running lights 7 pin harness on 2010 Ford King Ranch Thanks, asked by: Louis T. 0. The 7 pin connector to my trailer. Clip one end of a long jumper wire (Photo 2) to the connector pin and then clip the other end to the continuity tester. 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. when I hook it up, I have running lights and break lights, but no left turn. I have the factory tow package w/the 7 pin connector. Same story on two separate trailers. Checked fuses on my truck they look good. Trailer running/park lights not working, FUSES ARE GOOD!!!!! Trailer Running Lights Not Working on 2010 Ford King Ranch. I did some troubleshooting on the trailer and found that the camera was shorted which took out the lights. Not complicated. Rob371, Nov 18, 2018 #11. JH5370 [OP] likes this. 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. 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