I'll agree with Will's choice of Blue Sea Systems ACR. I've used one for about 9 years now and has worked flawlessly.

alistair

On 2011-11-11, at 8:01 AM, Will Taygan wrote:

> They are tied together with
> a Blue sea Systems Battery Link ACR - a "smart" relay.  I really like
> the smart relay, it doesn't lose voltage like a diode isolator, but it