JourneysDone

alain,
I had the same problem in June. Couldn't get the wiring harness to power the 7 pin brake lights properly as the LEDs don't draw enough power. For those reading this thread from the USA, at least in Ontario, if not Canada, all camper/trailers are required to have e-brakes if built beyond a certain year. It is illegal to tow one equipped with the brakes, but not have them connected.
My guy finally got the brake lights to work etc and i had him run a hotwire from the fuse box to the 7 pin to charge the battery in the trailer and to provide power while towing. The only issue i have with the 7 pin connector is that the running lights only come on, and stay on, after pressing the brake pedal. Not a problem so far as i only tow during daylight.
I did have several problems with determining if my journey was even equipped with the tow prep package (turned out it wasn't based on the VIN), but the dealer showed me physically and on the build sheet that my Crew has the oil cooler, tranny cooler and power steering cooler installed. and assured me i was good for the 3500 lbs. I purchased the wiring harness for $113 from the dealer and also was not pleased to have to do this.