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