Help! No trailer lights work

Try puting a thin piece of cardbord wedged under pigtail,while plugging it in.Bad pigtail? Ground.Does fuse keep blowing? Also check all battery connections on the battery.Loose negative will sometimes (even though truck runs and charges Good) will,cause intermittent random lights to not work,or come on .

 

U r the bomb.....!!very much I would like to thank you for your advice....took kick panel off.and sure as ####,.loose ground....16 mm deep socket with extension,and all is good.could not believe how xx loose was the nut ....got 2-3 turns out of it till it was tight....at first I thought the stud was turning and then it tightened...(thank God....&thank you)...my brother.,. Truly,. Your bro, Ken.,....

 

I had same prob. And it was definitely the ground behind kick panel...it was unbelievably loose....16mmdeep socket with extension ...is what fit for me....easy fix .....thanx

 

It only took 3 years for someone to solve the problem. Hope it gets you back on the road. Rates are up since 2016 so thats a bonus.

 

Behind kick panel,left of clutch pedle,on firewall is ground cable ,16mm deep socket with extension...worked for me....

 

I have a 2016 cascadia and I'm having a bit of trouble with the trailer lights I use one tractor and all the lights work I use the one assigned to the trailer and nothing which tells me its obviously the tractor. Where to begin, please help
Also on the same tractor that is able to make the lights on the trailer work the ####in brake lights stay on even when the truck is off . Grrr for a newer truck I dont think I should be having these problems
A little help in the right direction would be much appreciated , it will be worth your while I promise

 

drive toward freightliner dealer. That's the right direction.

 

If you suspect the truck ground may be the culprit, take a bar or anything and ground the fifth wheel, if the lights come on, you have a ground problem.
I pull company trailers that some have their own ground problems, I have installed a ground strap to my fifth wheel to make sure it grounds through the fifth wheel if nothing else.

 

Wickedwettt6977 did you ever figure this out? My truck just started doing this tonight and I've been trying to figure out how to fix this issue.

 

Where is this located I drive a 2013 cascadia