Here is some info to help get started.

http://www.vanagonauts.com/Dual-Battery-Relay-Install202.htm

http://www.vanagon.com/info/articles/upgrades/battery/index.htm

http://www.gowesty.com/ec_view_details.php?id=3567

http://www.gowesty.com/view_tech_talk.php?id=38

http://www.busdepot.com/details.jsp?partnumber=1738

http://www.van-cafe.com/home/van/page_1140

http://pws.prserv.net/synergy/Vanagon/Auxbat.htm

I think there are a variety of solutions, and different preferences.  So
doing a little study will make sure you understand the issues and pick the
best parts/wiring.  Also search the email list archives and also theSamba
for various experiences.

Roland

On Sun, Jan 8, 2012 at 10:17 AM, marc rose <mrose1028@gmail.com> wrote:

> I have a 1990 Carat that i just put a Riviera pop top on and want to add an
> aux battery for operating camping gear and down the road would like to add
> an invertor.  Anyone have any good sugestions for hooking in an aux
> battery?
>
> Thanks in advance!!
>