No trailer running lights
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Senior User
Joined: Oct 2002
Posts: 293
Likes: 1
From: Trempealeau Wisconsin
No trailer running lights
I have a 2017 F250. Yesterday I hooked up to one of my trailers, all the lights worked. I noticed just before dark when I opened the truck door that the running lights didn’t come on. I checked the connection, the turn signal and brake lights work but still no running lights. Today I hooked up to another and again turn, brake and electric brakes work but no running lights. I checked the fuses under hood, 42 and 65 if I remember correct, and both appear good but I haven’t had a chance to do a continuity test on them yet.
Does anyone have any suggestions on where to start looking?
Does anyone have any suggestions on where to start looking?
More Turbo
Joined: Sep 2019
Posts: 571
Likes: 56
This is going to sound crazy but this happened to my truck one of the first times I hooked it to my new gooseneck. LOL. I tried over and over , plugged, unpolugged, put dilectic grease on the plug etc... then it HIT ME....... I had my truck lights on " Auto" !!!! All the way over to the right on the dial. It was DAYLIGHT out so of course the lights were NOT on!!! As soon as I turned the dial to OFF and up one to turn them on manually, all the lights worked on truck and trailer!!!! I felt totally dumb. Not sure this is your issue.
Senior User
Joined: Aug 2020
Posts: 117
Likes: 2
This is going to sound crazy but this happened to my truck one of the first times I hooked it to my new gooseneck. LOL. I tried over and over , plugged, unpolugged, put dilectic grease on the plug etc... then it HIT ME....... I had my truck lights on " Auto" !!!! All the way over to the right on the dial. It was DAYLIGHT out so of course the lights were NOT on!!! As soon as I turned the dial to OFF and up one to turn them on manually, all the lights worked on truck and trailer!!!! I felt totally dumb. Not sure this is your issue.
Thread Starter
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Senior User
Joined: Oct 2002
Posts: 293
Likes: 1
From: Trempealeau Wisconsin
This is going to sound crazy but this happened to my truck one of the first times I hooked it to my new gooseneck. LOL. I tried over and over , plugged, unpolugged, put dilectic grease on the plug etc... then it HIT ME....... I had my truck lights on " Auto" !!!! All the way over to the right on the dial. It was DAYLIGHT out so of course the lights were NOT on!!! As soon as I turned the dial to OFF and up one to turn them on manually, all the lights worked on truck and trailer!!!! I felt totally dumb. Not sure this is your issue.
I just dug into things a little further and found another fuse, number 99 it’s a 30 amp at the very back of the fuse block. It was blown, no idea why. I replaced the fuse, hooked up to another trailer and all seems to be good now.
Freshman User
Joined: Dec 2019
Posts: 46
Likes: 1
lol, that wasn’t my problem but I did check that.
I just dug into things a little further and found another fuse, number 99 it’s a 30 amp at the very back of the fuse block. It was blown, no idea why. I replaced the fuse, hooked up to another trailer and all seems to be good now.
I just dug into things a little further and found another fuse, number 99 it’s a 30 amp at the very back of the fuse block. It was blown, no idea why. I replaced the fuse, hooked up to another trailer and all seems to be good now.
Fleet Mechanic
Joined: Jul 2008
Posts: 1,937
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From: Southern Crescent
Making note to self.... thank you.
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Lead Driver
Joined: Oct 2014
Posts: 5,940
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From: NY/Canada border
This is going to sound crazy but this happened to my truck one of the first times I hooked it to my new gooseneck. LOL. I tried over and over , plugged, unpolugged, put dilectic grease on the plug etc... then it HIT ME....... I had my truck lights on " Auto" !!!! All the way over to the right on the dial. It was DAYLIGHT out so of course the lights were NOT on!!! As soon as I turned the dial to OFF and up one to turn them on manually, all the lights worked on truck and trailer!!!! I felt totally dumb. Not sure this is your issue.
This is only the running lights on the trailer fenders. Same thing happens on at least 2 of my trailers, I'm not sure about the other 3. I don't recall this happening when I had a 2017 but it happens with my 2019 every day.
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More Turbo
Joined: Sep 2019
Posts: 571
Likes: 56
My truck headlights are always on auto. Every single day when I start the truck, the running lights on the trailer come on no matter whether it's day or night. They remain on as long as the truck is running.
This is only the running lights on the trailer fenders. Same thing happens on at least 2 of my trailers, I'm not sure about the other 3. I don't recall this happening when I had a 2017 but it happens with my 2019 every day.
This is only the running lights on the trailer fenders. Same thing happens on at least 2 of my trailers, I'm not sure about the other 3. I don't recall this happening when I had a 2017 but it happens with my 2019 every day.
Lead Driver
Joined: Oct 2014
Posts: 5,940
Likes: 1,355
From: NY/Canada border
Funny how some of these trucks seem to have their own little idiosyncrasies. As stated, my 2017 did not do this but the '19 does. I actually kind of like it because when I look in the mirror it reminds me that I did indeed plug the trailer in!
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