Yup, on the "new" style fuse panel (blade fuses) its fuse #3. Crimp
on a male spade terminal to line from aux battery and lead up and
around panel so it can be pushed into the *lower* female spade
terminal on the fuse location (fuse removed, circuit now fuse
protected from new small fuse panel described below. Alternate would
be to put in inline fuse).

I have that set up right now on my van, fuse#3 powers radio, interior
lights, lighter.

Back at my dual aux batteries (2 small 12 A/hr gel cells under
driver's seat) I have a small aux fuse panel (from new beetle) that
takes power from my automatic charging relay ) which is beside
starting battery, under pass. seat) and sends it to the above
mentioned fuse #3. The small panel is fused and has distribution
points for further power needs.

Or, you can follow the wiring instruction in bentley for dual battery
set up.

alistair

On 2-Oct-10, at 8:18 PM, Loren Busch wrote:

On Sat, Oct 2, 2010 at 6:40 PM, Mike Miller <mwmiller@cwnet.com> wrote:

> As I understand it if a single fuse, (don't remember the number) is
> removed
> and powered is applied directly to the hot side from the auxiliary
> battery
> then all those things are only powered from the aux battery. This
> is what
> I'm planning to do on mine, as soon as I find out which fuse it is.
>

Fuse 3
BUT may be different depending on earlier years? Fuse 3 on the later
models.  And in my case ('90 WEsty) had to do some jumpers on a
couple of
plugs also.