This has been talked about for years, many have tried it. The main
weakness is that the long stock wire runs that supply +12 to the relay
reduce the charging voltage enough that the aux battery never fully
charges. This problem is made worse when the fridge is running on 12
volts at the same time you are trying to charge the battery. For those
with the stock battery under the passenger seat, the easy answer for
this weakness is to run a wire from the main battery directly to the
relay, instead of using the original feed wire from the dash to the relay.

Mark

jon wrote:

>Maybe someone already said this, but I was looking in the Bentley at the
>80-85 Westy schematic. Seems an aux. battery could be easily added:
>
>The Refrigerator 12-volt heater relay could be used as the battery
>disconnect (well, if it's big enough). Simply connect the aux bat (through
>a fuse) to terminal 30. Move the connection from terminal 87 to 30 (this
>supplies power to the water pump, LEDs, etc) are you are almost set.
>
>The center light would probably need to be wired into this system, instead
>to the door/courtest light circuit. You'd also want to wire your stereo
>into this circuit.
>
>Hmmm, I've got a nice AGM battery just waiting to be wired in. Hmmm.
>
>Add a trickle charger for winter, and all is set.
>
>Thoughts?
>
>Jon
>
>
>
>