Trailer Running Lights not working 2019 F-250

Asked by veb2127 Aug 05, 2020 at 09:58 PM about the 2019 Ford F-250 Super Duty XLT Crew Cab 4WD

Question type: Maintenance & Repair

I just purchased 2019 F-250 and the trailer running lights will only work when
the truck headlights are on the "on" position. If I switch to automatic
headlights the trailer running lights do no work. Turn signals, trailer brakes and
brake lights work great when headlights is in the on position. How do I get the
trailer running lights to work when the automatic headlights is selected?

2 Answers

F_O_R answered 4 years ago

If you want the running lights on all the time you need to rewire the trailer and run a new circuit from your truck to the trailer with a switch. The running lights should turn on once the headlights turn on at dusk if you have the switch on automatic.

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Kjhelbing answered 4 years ago

I haul a horse trailer with a 2019 f250 xl, and when I had the automatic lights on the truck/trailer brakes checked when I put the right turn signal on. This was quite a jerk, and I did have a horse in the trailer at the time. I seriously thought I was loosing my mind. Shortly after this happened the truck’s message center had a notification stating left turn signal malfunction. What I found is that when I plug the trailer into the truck, select headlights on. REGARDLESS. Otherwise, issues will rise. I honestly don’t have time for this type of crap so that’s what I do.

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