i have a 4 guage  wire running from my  aux over to the prime batter
with one of those battery switches in the line.    in the off position
my isolation relay is in the circuit and operates normally. with the
switch on  it connects the two batteries together  directly  bypassing
the isolation relay.  4  guage is actually larger  than most jumper
cables.
jimt
westydriver
82 westy

On Thursday, Sep 26, 2002, at 16:21 America/Denver, dave bowers wrote:

> While I was jumping my self (so to speak), I wondered .... is there a
> safe
> way to hardwire a proper gauge wire from the positive terminal of my
> Aux.
> batt. to the pos. terminal of my primary batt with a switch in between?
>