"This is all correct and I did this too. Now that I have installed a Progressive power management system I don't need to, the progressive does it for me. It waits 10 seconds or so to apply power to the trailer after the plug is put in. No arcs."
Progressive recommends the post be off before plugging in the EMS unit, then energize the post, give it the two minute check period, before plugging in the RV.
Dobe Fanatic - Largo, Florida
2012 Flagstaff T12RB A-Frame