My '86 wolfsburg came like that.  With the antique cooked VW-Audi
battery under the driver's seat.  I later inserted the interior from
an 85 westy and hooked stuff up the way I wanted it.  Including
powering fuse #3 in the main fuse box from the aux battery.  If I'm
going to be driving for several hours with fairly short stops, I run
the fridge in AC mode off of an inverter that draws from the aux battery.

Edward

At 09:49 PM 10/2/2010, Scott Daniel - Turbovans wrote:
>I'm pretty sure the 85 Wolfsburg Weekender I had ..
>was originally delivered with two batteries.
>it has the under-driver's seat relay for charging an aux battery.
>and it had one of those white plastic case, 'vw-audi' batteries with blue
>lettering , if anyone remembers those.
>I saw tons of these exact batteries in VW's in the late 80's, early 90's...
>but hadn't see one in years and years.
>
>I am pretty  sure I was the first person to ever inspect that 2nd battery
>under the driver's seat ...it had been cooked dry a long, long time ago, and
>sitting there dead for years.  Pretty sure no one ever even knew it was
>there at all.
>  There's no indication that the relay under the seat wasn't factory
>installed..
>pretty sure it came with two batteries, from day one, in germany.
>
>The reason it had that two battery system is it comes with a 12volt / 110AC
>fridge ..
>that attaches to the floor just inside the sliding door with two screws ...
>ones you can undo with your fingers.
>
>the relay keeps starting battery voltage from being drained by the fridge
>when engine isn't running.
>Only power from the aux batt can get to the fridge with engine
>off,...........then then when alternator charges, relay energizes, and # 2
>batt is charged .
>
>I think it was pretty clever of them to make aux battery charging happen
>only after alternator is charging.
>Makes total sense of course.