We have an 08 Edge. The baseplate and wiring of Roadmaster Invsibrake system was IMO difficult. Why, I had it installed professionally and it still needed a lot of tweaking. If you do not have a charging system from the coach to the battery, the battery will die! Yes, place the shift in neutral and turn the key to the aux. position. Be sure to turn off the AC. Someone recently stated their Edge had a start button? If so, that's a game changer on the key in the aux. position? Check with Ford. In your post you state leave the ignition in neutral perhaps the new aux. position? Also, be sure to start the engine and allow it to run cycling the tranny fluid at every stop.
Clay & Pebble.. Miss Butter our sweet Goldie (Jan. 2005-Jan. 2015) Sissy our Border Collie
2012 Providence 42 M. Spartan Chassis, 450 ISL
Ford Edge toad, RM All Terrane, TST TPMS, SMI Air Force One, RVM95....