Weird trailer connector issue, lights not working?

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Feb 28, 2019
Duluth, GA
Getting our travel trailer ready to head out for our first trip this year I decided to hook it up to the GX for the first time to text everything. Plug the harness in to the 8 pin connector and no lights, no signals, no brake lights. However, all the light come on on the trailer when the headlights are turned on??? :hmm:

I know the trailer is good since it's not even a year old and worked great when I towed with the Grand Cherokee just a few months ago.

I'm wondering if anyone on here has had a similar experience? What could be the cause?
Did you test the connections? My trailer lights don’t come on until the GX lights are on as well but the brake and turn signals work.
There is a diagram on the inside of your cover. Find a ground the ground and you can easily test each operation.

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