I have to agree with TiltonBB regarding the truck fuse being the issue.
I found same reference to 'Trailer Tow Park Lights' (25Amp), in my owners manual.
Since I tested trailer connection on truck side with 4-Way Connector tester and
received no light on tester for 'running light', I have to assume, it is that 25Amp fuse. The fuse is a 'module type', so bringing to auto parts store
so they can provide exact type I need.
THanks !
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