I had the M/B wiring loom installed by a well known sprinter mech. Took 3 trips . I have a 4 pole
conector on the hitch,, thats all I need no brakes on the trailer. When I plug into my trailer I get
a Brake warning on the dash. I have connected to other like trailers with the same results. I don't
think there will be any harm done, with just a brake warning. When I get the chance will make the
100+ mile trip back to the original installer,to see if there is a solution.This all took place on a 2014 cargo sprinter van.