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