Out of interest which diagram? Not that I have any reason to not believe you but I've studied them quite a bit as if I get around to putting the second battery in this is what I'd like to do. I've found the diagrams around power sockets fiendish to read as they have pretty.much every possible option on with a less than helpful " *depends on equipment" next to every.option.
Sorry it’s me getting a bit mixed up between my hand annotated diagrams from stripping my factory wiring out, the originals and the advice that is often given on this forum that the upper socket is leisure and lower is starter, which is not the case on a T6.1.
On T6.1s both cab sockets are shown as wired to the same fuse SH6 as per “Cigarette lighter and 12v sockets from May 2019 No. 34/1”.
So both are fed from the same battery. So that’s where my “wiring diagrams confirm it” comment originated.
Now which battery?
Looking at diagram “Second battery, not camper, (8FB) From Aug 2019 No 78/1 it shows that only fuses SH9 and SH4 are fed from the secondary battery via fuse SG2 so logically you’d think the cab sockets were connected to the starter, but this certainly isn't the case and where the “depends on equipment” must come in.
On mine, from the factory, SG2 was a common feed to fuses SH1 through to SH8 (not just SH9 and SH4) and my cab sockets were actually wired to fuse SH7 (and not fuse SH6)!!, hence my hand annotated diagrams.
Since upgrading to a Roamer 230SB, I had to scrap the SG and SH fuse block and have rewired to my own fuses.
I’ve yet to hear of someone with a T6.1, with a factory installed 2nd battery, where the cab sockets are connected to the starter battery or one to the starter and one to the leisure, but maybe there is an equipment option where it does happen.
Shows you have to treat the diagrams (and advice given) with caution and take note of the “rough guide” disclaimer.
