Class A Motorhome Wont Start!

MeganRV wrote:
Thank you for some all of your advice. I am an Aircraft Mechanic/ Avionics I know how stuff works I understand power and how to trouble shoot.

I stated in my first post im confused of what everyone is saying. My first thought is simple straight to the power and grounds. Then Im gonna work from there. i just need advice to help work this out while i Wait

ps I did try the emery button pressed it in to see what happened and yes it will try to crank but to weak.

Well you shouldn't have any issues figuring this out. As for your chassis (starter) battery being dead, it's simple automotive troubleshooting. You have a new battery so it's not that (possible but not likely). You have something draining the battery, should be a simple hunt for you. I bet there's fewer wires in that motorhome than an airplane. Since you already know how power works and how to trouble shoot you're off to the races.