I didn't check bulbs since it's doing this on three different trailers.
I do not believe it's the adapter plug sonic this happens with two different ones.
I will try it on another truck to rule out trailers/adapter issues.
I will test my trucks plug in receiver with ohm meter or volt meter (I think autozone will do it) and go from there.
(It's got to be my truck I just don't know where/why!)
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