>
> The GW kit is described as using an isolator. If the diodes in an isolator
> fail, it will typically fail in the "closed" position, joining the two
> batteries even while the key is off,
>

The GW kit is a big relay, like an old starter solenoid.  Driven off the
fridge relay.  Their instructions make it easy to install at the expense of
performance.

Yrs,
d