I have a 2023 F-150 Lariat (3.5L Ecoboost), with tow package, that I bought new in Aug'23. Every time I tow with my 5' x 8' open trailer, I get multiple error messages in the main info display like:
- Trailer Disconnected
- Trailer Lamps Left Side Error
- Trailer Lamps Right Side Error

Any idea why this is happening? I'm using a 6" adapter (from Amazon) to connect the trailer wiring harness to the truck wiring receptacle. Without the adapter the trailer harness isn't long enough to reach the bumper.

 

I’d suspect the Amazon adapter or trailer. Any other trailer you can hook up to and check?

 

Sounds like a connection with the harness. Try some dielectric grease and check all connections.

 

If it were me, i'd buy a trailer wiring harness, cut the plug off the one on the trailer and extend the trailer wiring to be more than long enough.

 

I connected the Curt wiring harness adapter to the truck, then connected a tester to the end of the harness. I cranked up the truck, cycled through left and right turn signals, then cancelled turn signals and applied the brakes. You can see the appropriate LEDs light on the tester, so this seems to indicate the harness adapter is good.

Another curiosity - when the trailer is connected to the truck through the harness, the trailer lights operate correctly.

Someone mentioned using dielectric grease, but my understanding is that product is not intended for the electrical contact pins, but instead, is for the rubber boot around the connector. So I don't understand how that would affect this problem.

I can't connect the trailer directly to the truck due to the drop between the truck receiver and the trailer tongue.

 

I have had the same thing multiple times on my 2022 when towing my travel trailer never have firgured out what it was.I would stop **** the truck off unplug my 7 pin adapter and plug back in and it would be fine.

 

Mine has started saying that the trailer battery isn't charging. Well, duh! It doesn't have a battery, it's just a simple utility trailer.

 

I will sometimes get the trailer disconnected message on my dash. Pretty worrisome the first couple of times. It seems the female trailer plug is not a perfect fit, not the truck plug. On my truck, jiggling the plug cures it. I would make sure the ground wire is in good shape since all your lighting goes bonkers.

 

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