Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work  

I a skeeter trailer, and the turn signals, break lights, back-up lights work, but the running lights stopped working. where should i start first looking for the problem?

Hello I have a trailer where the running lights don’t turn on but they flash when I lock my truck I’ve tested fuses checked the plug connections any ideas?

I have a 2016 Jeep Grand Cherokee. My boat trailer brake lights, turn signals all work fine but have no Day Running Lights. All fuses checked out fine. My previous trailer never had this issue (just sold it 3 days ago) All new wiring, grounds are clear and have great contact with bare metal. Please Help im so frustrated ??

I am having issues with my running lights on the truck/trailer. I thought I originally had an issue with the relay switch. I had the switch checked and it was determined that was not the issue. What we did to get running lights back to the trailer was to take out the relay and put in a jumper. By doing this I am able to have running lights, but I have power continually to the trailer lights. I was wondering if it could be an issue with wiring harness junction block. I have a 2016 Chevy Colorado LT 4WD 3.6L motor. Any help will be appreciated. Thank you.

All of my trailer lights work as normal. Besides the running lights on the right side tail light. The brakes and signal works on it. It is not the light itself and I have cleaned the grounds. There are green and brown wires running back and brown wire that runs from the connection to the rear middle bar. At one point i was able to get a faint light while the brake and signal were not on.

so, I have the same issue.. however, on my vehicle side my 4 pin flat has indicators to let me know they're getting power. I have brakes, turn signals, but no running lights. I used a wire wheel on my drill to prep the ground spots for each light and the ground to the trailer. the indictor on my vehicle side says I am getting power there. it almost has to be the ground? right? or corrosion on the vehicle side plug - (trailer side is new)

You are a life saver ????

I have break light on my trailer but no marker light. On my 2003 Chevy. When I hook up with my 2019 Chevy everything works. Why is my 2003 Chevy not giving power to marker light but power to my break light?

I have a 2010 Ford F-150 XLT. My trailer lights were not working. Turn signals work when hooked up to truck trailer 4 pin connector. The problem was Relay for Trailer Tow Park Lamp Relay was bad. This is Number 6 in Fuse box in engine area. Hope this helps someone.

I had all lights working and trailer all finished up all my marker lights worked i plugged truck in and my rear tight taillight was the only one not lighting up with truck lights on so I tried to diagnose it and blew my ram 1500 30 amp trailer fuse so I went and replaced it and now I have no marker lights at all but still have brake turn and hazards This is so frustrating and no online fuses in trailer wiring

I replaced the lights and wire on boat trailer (aluminum trailer). I have brake and turn signal but no running lights. Thanks

I have replaced the wiring harness on my trailer. My truck running lights work and turn on. I have blinkers and turn signals on my trailer but not running lights…. I re did the ground connections for the trailer, still no running lights. I’m stumped can you give me any advice on where to go?

My front trailer lights work. The rear doesn't. If I take out left side rear light and touch two post together lights work, until you touch brake then they go back out. I have replaced the rear three post plug for that side. Still doing it. Any thoughts?