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Message: <blockquote data-quote="airshot" data-source="post: 497794" data-attributes="member: 1183"><p>I would agree there...where I have had issues with the round 7 pin is when adapting to the 4 flat...  When I had big trailers with brakes they were never an issue.  But over the years I downsized to smaller trailers without brakes and usingbthe round to flat adapters created problems.  Also there were changes to vehicle wiring from 2000 up to modern wiring....my Jeep is factory wired for both 7 round and 4 flat ( trailer tow pkg). My boat trailer has a flat 4 pin and it works fine in the flat 4 factory plug....but....if I plug in a 7 round and plug the trailer (4 pin) into the space on that round adapter, the trailer lights dont work, but they did on my 2000 Blazer. !!!  I never tried to figure it out!!</p></blockquote><p></p>