Typically one runs the positive wire from the starter battery to the
space under the drivers seat. Shorter run of wire that way. I imagine
though that one could put the aux battery in the engine bay, but a
better place would be under the rear seat. In those cases, the run
from starter would be about as short, but you would have to extend the
blue wire from alternator though. (this is the wire that turns on the
relay so the relay will connect the starter and aux. battery when
engine running)

I installed my aux battery under the drivers seat. I ran the #10
positive wire through a spare piece of VW nylon protective hose. That
was "over kill" though in terms of protecting the wire.

There's tons of info regarding aux. battery (or "house") battery
hookups in the archives.

Here's some links to get you going though:

http://www.keithandsylvia.co.uk/tech%20pages/splitcharge.htm

http://www.sittser.com/

http://www.geocities.com/harald_nancy/dualbattery.htm

Cheers,

Neil.

--
Neil Nicholson '81 JettaWesty "Jaco
http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
http://web.mac.com/tubaneil
http://tubaneil.googlepages.com/

On Mon, Jun 30, 2008 at 7:27 AM, Bradley Gordon <bsgordon39@hotmail.com> wrote:
> Hi everyone,
>
> I am about to wire a second deep battery in my bus and have heard of several ways to do so.
>
> 1.  Using wiring already under the driver seat.
> 2.  Running a hot wire from the starter.
>
> Does anyone have experience and if so, I would greatly appreciate any wrongs, rights, how to do info that you may have.  Is there anywhere to find a wiring diagram as well?  Thanks so much for your time and attention and helping keep a Mississippi boy cool in this summer heat!
>
> Cheers,
>
>
> Brad
>
> 84 Westy Wolf