Someone disconnected my power converter; how do I reconnect it?

I know your website is based on auto repairs, but I have a 1996 Ford Dolphin motorhome on a super duty chassis. Unfortunately, I let someone else do some troubleshooting on my batteries and in the process, he disconnected my power converter so when I run my generator my batteries are not recharging. I am constantly stuck with a drained battery even when I plug into shore power. As you know the whole purpose of the power of converter is to keep the batteries up to charge when you're using the 12v lights. All I need to know is how to hook it back up as the guy who did this will not answer my messages or my phone calls. Please help. I can send pictures of the solenoids that are in the compartment where the power converter is if that would help.