Power Supply Unit

Perhaps the dealer or individual who sold you the motor caravan knows about a PSU, if there is one.

I think it varies a lot. In our 2005 Swift made caravan it was in the Wardrobe and totally hidden by being boxed in, with switches on the front of the boxing. The 12 volt fuses were elsewhere. In our 2014 Bailey it was in a seat box and had fuses on the front. In our current MH it’s within the battery compartment and has more fuses on it than the other two combined.

I was quoting from the Swift Handbook for 2009 motorhomes which is available on the internet..

Ah...but Steve, you have a Schaudt Elektroblok not a Sargent unit, don't you?

loads of wires on there as it's a 12v distribution unit, too?

we have CBE kit...a PSU, distribution unit and charger all in a big grill-fronted box in the garage, along with a CBE control panel above the hab door...

For the OP, the Sargent units are pretty much as my link, it's just the location that can often change.