The Causes Why Tail Lights Not Working. Jun 23 2013, 4:55pm. When the fuse is blown it does not allow the circuit to complete. Trailer Lights Not Working Solution: Replace the trailer light wiring How to wire a new trailer light system. Enclosed trailer lights not working. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. A 5x8 with the 4 prong flat blue as well as a 7x16 car hauler with the 4 prong flat too. They fuse the trailer running lights seperate from the trucks, so if you have a bad connection or ground the connector out, it will blow the trailer running light … Thanks for the help all; I'm doing a search, but cannot find specifically what I'm looking for. It has gotten worse over the last month or so. Trailer lights not working. Enclosed trailer lights not working. Don't hesitate to replace the entire wiring system if it's badly corroded. I have a 2012 Silverado that I use to pull an enclosed trailer. Tapped into the wire above the fuel tank with a test light and had nothing. I recently had a 2014 silverado and pulled all three trailers in the last couple months and all the lights … My best friend's 2004 2500 with factory trailer wiring has the following symptoms. The trailer wiring isn't the problem. All trailer lights work no problem just the … I will check the ground for the trailer lights. When I first got the truck the trailer interior lights worked and now they don't . A new harness includes the … Brake controller, left turn, right turn, brake all work just no marker lights. As if the trailer is not connected. If all else fails and you're finding badly corroded parts, you can buy a new wire harness for about $20. Nov 23 2019, 9:15pm. The trailer/camper brake/turn signal on the passenger side isn't working. I am currently looking for any other suggestions. A 7x16 enclosed that has the round connector. I have tried a trailer with LED lights and 1 with regular bulbs. Inside trailer lights not working. The truck's running lights will work, but the trailer won't if the fuse is blown. As the rear lights are not connected, they do not illuminate. Both trailers react the same. Have current on both side of the fuse under the hood. We did check fuses. Enclosed trailer lights not working… coming out of the circuit board is. But, when I do not have a trailer hooked up and I turn on my left turn signal my 4 ways come on. crossed over ihave2 hot green wires can u give me an ideal 2 get ,brake reverse turn signal and running lights 2008 Chevy Silverado 1500 All outside lights ok, but inside the trailer - … Troubleshooting Trailer Wiring on 2008 Chevy Silverado 1500 Question: the taillight wires. At first I could just hit the 4 way button on for a second and the left turn signal would work fine. My silverado blew the fuse for the trailer running lights in this under hood fuse block. 2008 Chev 2500 Silverado LTZ diesel. I have three trailers. Trailer Lights Not Working when Connected to 2008 Chevy Express 2500 w/Factory Tow Package Recommended Wiring For 7-way & 4-Way Flat Trailer Connector On 2014 Honda Pilot Replacement 7-Way and 4-Way for 2003 GMC Sierra With Factory Tow Package 2002 Chevy Silverado Tow Package Turn Signal Circuits Work But Not Brake Light Circuit What Connector is Needed For 2009 Chevy Silverado With Trailer Towing Wiring To The Bumper Replacement 7-Way Trailer Connector for a 2003 Chevy Silverado The truck is not throwing any codes, simply the trailer brakes are not putting out anything. The common causes the tail lights do not work are; Blow fuse – The first thing the mechanics check is the fuse corresponding to the rear lights. With the wiring connected, whether stepping on the brake pedal or squeezing the lever on the ITBC controller I get no output and brakes don't engage. Family Handyman. My best friend 's 2004 2500 with factory trailer wiring has the following symptoms to replace entire... 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