There are some good videos that show you how the standard electrics work on a Sprinter. Here’s one that opens up the distribution box on the house/starter battery.
However, many videos and blog posts assume you have a left hand drive model. Even the manual – written in UK English – assumes you have a LHD model.
I wanted to figure out how to disconnect the battery so I could safely connect a split charger. Here’s how I found the ground point from the negative terminal of the battery on our 2012 NCV model.