--- Mark Drillock <mdrillock@cox.net> wrote:
> Sure, that one big wire will work for starting, but
> only if the ground
> wire to the second battery is large already.  The
> same amount of current
> flows through the negative lead of a battery as the
> positive lead.

In the stock dual battery setup found in '85-'87
non-GL Campers, the auxiliary battery uses the
identical grounding method as the starting battery,
using the same battery ground cable assembly.

Here is an old photo:
<http://home.earthlink.net/~tjhannink/photos/Under_Drivers_Seat.jpg>

I have since added a yellow top Optima and a relay
that uses the on/off signal wire from my headend unit
to control power to the rest of my A/V components.

<http://home.earthlink.net/~tjhannink/AV_System_Diagram_and_Product_Specs.htm>

Thanks,

=====
TJ Hannink
Goldibox - 1987 Vanagon Camper, Wolfsburg Edition
Winter Park, Florida
http://home.earthlink.net/~tjhannink/
http://groups.yahoo.com/group/wolfsburg_campers
http://photos.yahoo.com/tjhannink [Vanagon] Album

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