Which Battery or Batteries start the Generator?

[Bob & Carol Howald`]

Jack & Liz......If you want to check on your coach which battery is
responsible for what system, just disconnect the ground on the engine
battery's and see if the generator will start. I've had my battery's in
and out numerous time's. I've redone the house tray's and also made new
hold down tie's for the engine start battery's. I have a full 8 battery
house bank and 3 battery engine start bank. Iam in the process now of
replacing my house battery's with new one's. What type battery are you
using for house deep cycle battery's I want to replace my 8 battery
bank. Thank's Bob 93pt. Illinois