The running lights are not working on my trailer. I have brake lights and directionals that's all. I've hooked up multiple trailers of mine and still have the same problem. Is there a running light fuse or relay on these new f150s? I try to look up on Google but didn't get anywhere. Thank you for your help

 

try looking in your owners manual at the fuse box lay out... yes they do !!

 

A fuse and a relay. Did they used to work?

 

I found the problem. It was the fuse number 34 under the hood. Thanks for all advice

 

Bingo.. glad you found the problem.