my battery keeps discharging and I understand dynons use power while off? does anyone have any advice on this..
If you have the "Keep Alive" wire (Pin #2, yellow wire) connected, then the Dynon EMS will use power from your main battery to keep the clock circuit alive. But this is a trivial amount of current and should not discharge your main battery. Dynon Service Bulletin 120109 (http://www.dynonavionics.com/docs/support_bulletin_120109.html) recommends that the Keep Alive wire be disconnected on all Dynon units.