SH2 - 15A - Purely wired off the leisure batteries, but clearly lots of other loads are as well, so voltage drop will depend on the loads also hung off all the shared pre fuse wiring and the lengths/csa of the cable and number of in-line connects - 12v sockets are very much at the end of a lot of power / earth wires that support all the camping functions. (as per
@sidepod comments on other post today) - 0.5v-1v would certainly not be unexpected with some loads, over 2v would start to make me suggest a lot of down stream loading / bad batteries or an issue. FYI cigar sockets are horrible things, so make sure the actual socket and plug are in really good condition before looking elsewhere.
@Tompoole - similar post to yours as well.
There is a large inline connector under the kitchen unit that we have had a few reports of corrosion and the vast majority of the camper kitchen wiring goes through it.
See this thread
So, recently bought a pre-loved 2018 Cali T6 Ocean 4Motion. After a couple days, the control unit display went dead, same symptoms as this thread https://vwcaliforniaclub.com/threads/control-panel-dead-on-2017-ocean.38599/ After a day of not working, it came back alive, then dead again another...
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