I have a 2010 Z520C, Here is what I do everytime, I switch main power switch in battery compartment to on, hit green start button 1 time to get red light on, enter code 1234 (mine is different), hit green start button again which turns second red light/everything on, then green start button again to crank engine. When done at end of day or parking boat for lunch or something I hit code 1234 and red kill button to turn off all power. I turn off main switch in battery compartment when boat is on trailer.
2010 Ranger Z520C
PB - Large Mouth Bass - 8.03