Split charging/wiring help

[Fishpaste]

I recently bought a Bongo and have been checking through a few things trying to work it all out.

I found that there were two starter batteries (I believe one was being used as a LB). These were connected to the Ryder device which it looks like has been installed as a kind of split charger. The +ve and -ve from the starter battery are connected on one side. Then one of the switched supplies goes to the LB and the other goes through the bulkhead into the vehicle.

Ryder unit inputs

Ryder unit outputs

Firstly I have installed a proper leisure battery which appears to be working well. I am now thinking about installing a proper VSR in place of the Ryder unit. Is this necessary and if so are there any recommended units?

Finally I have attached a wiring diagram to show what I have worked out so far.

Wiring

Any ideas on what the snipped off wires are/were for? Is there a good way to check this out with a multimeter?

[Fishpaste]

Wooops I put the wrong wiring diagram on. Here is a revised one

Wiring

[g8dhe]

See your FB post already answered there!