It appears that sometimes that when NOT hooked up, you might end up draining your battery using the radio, and you cannot start your vehicle. I added an additional battery next to the old one with much difficulty and put a switch in the cab so all you have to do is switch it on and it will have enough juice to start your RV, I will be posting this at
Eric's Personal Insight Corner | From the Desk of Eric Kirkhuff, CEO YourHost.com so you can see what I did.