V6.1 electrical guidance please

[Glenhyrst]

I'm a new Joker owner with basic electrical knowledge and zero specific T6.1 electrical knowledge.
Can someone recommend a "teach yourself electrics" particularly applicable to this and similar vans?
The acronyms and jargon used on this site by clearly knowledgable people impress me much as does an article on quantum mechanics but at the end of the piece, leave me little the wiser!
Thanks in anticipation.
Phil
PS it might help me understand how Wandahome say my 2 leisure batteries are working together when only one shows any voltage drop and why my van starter battery sat on my drive doing nothing for 2 days dropped its voltage from 12.5v to 11.7v.

 

[Californication69]

I guess try and find someone local to you who’s willing to show you the basics for a brew or beer ?
It’s not easy explaining via a forum.
But maybe check YouTube for exactly what you want to do ?
Or ask a specific Q, and we will point you in the right direction

 

[yossarian]

Wandahome say my 2 leisure batteries are working together when only one shows any voltage drop

Sounds like you bs detector is working fine.