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.

Mark

TJ Hannink wrote:

>--- Mark Drillock <mdrillock@COX.NET> wrote:
>
>
>>I don't like or see the need to disturb the VW
>>factory wiring so a bigass relay is my preference.
>>Don't have to remember to set anything and no damage
>>
>>
>
>
>
>>can occur. I like being able to use both batteries
>>for starting so I use bigass wires too.
>>
>>
>
>The factory (VW/Westfalia) wiring for the aux battery
>setup in my Camper uses a small (30A?) relay that
>connects the batteries in parallel with a 10-awg wire
>only when the engine is running.
>
>I use this 'bigass wire' to connect them for starting
>purposes.
><http://home.earthlink.net/~tjhannink/photos/jumper_Cable.jpg>
>
>
>Of course, since my Camper didn't come with swiveling
>front seats, getting to both batteries is relatively easy.
>
>=====
>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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