Is anyone familiar with ford transit electrical systems?

Hi all,

I’ve recently acquired an ex-BT transit which had a full workshop in the back so has additional 12v system in the rear. It has dual batteries and a split relay system which was used to power appliances in the rear when engine is running. I’m looking to remove this relay completely but having a hard time finding anything on the internet about how to do this properly - anyone have any experience with this?!

Thanks in advance.

Harry