I had the same problem with the Edge I now tow and the 2009 I towed before that. This Edge has push button ignition and navigation. I just had a battery charge line installed. I haven't taken a long enough trip yet to see if it works.
2015 Fleetwood Excursion 33D
2016 Grand Cherokee Limited
Retired Law Enforcement
U.S. Army 1965-1973/RVN 1968-'69
I am the frequent recipient of "Get out of the way old man!"