Trailer plug No auxiliary power
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2nd Gear
Joined: May 2025
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Trailer plug No auxiliary power
I have a 2018 F250 and when I have no power to the auxiliary power wire in my trailer plug. I might have overlooked it but I can't seem to find a fuse for it. Was hoping someone on here could help me out.
Cargo Master
Joined: Apr 2003
Posts: 2,058
Likes: 424
From: Too close to Houston
Are you just probing for power? I believe certain conditions have to be met before you’ll see power. Like trailer connected, in gear, etc.
I remember a thread here years ago where someone had a test light hooked to the trailer plug and got it to light by starting the truck pressing the brake and putting it in gear. (Or something like that)
I remember a thread here years ago where someone had a test light hooked to the trailer plug and got it to light by starting the truck pressing the brake and putting it in gear. (Or something like that)
Thread Starter
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2nd Gear
Joined: May 2025
Posts: 2
Likes: 0
Are you just probing for power? I believe certain conditions have to be met before you’ll see power. Like trailer connected, in gear, etc.
I remember a thread here years ago where someone had a test light hooked to the trailer plug and got it to light by starting the truck pressing the brake and putting it in gear. (Or something like that)
I remember a thread here years ago where someone had a test light hooked to the trailer plug and got it to light by starting the truck pressing the brake and putting it in gear. (Or something like that)
And to ensure that the trailer was not the problem I connected to my camper with the truck in gear and checked the 12v wire going to the camper battery and it was not getting power from the truck.
Tuned
Joined: May 2010
Posts: 494
Likes: 129
From: Pleasanton, CA
On my son’s 2015 he had a similar issue. It turned out to be a loose fit between the trailer female plug, on the rear bumper, and the trucks trailer harness plug that was a little lose where it attached through the rear of that female plug. I unplugged it, cleaned the dust and dirt out from the rear added dialectic grease then securely plugged it back in, it has a clip at the rear of the plug, this solved his light issue.
Mike
Mike
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Joined: Jul 2013
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