No worries. I've done that a few times ... one of the benefits of having an
aux bat.
You're not "forcing" anything through the separator or relay by jumping
directly
from + to + on the batteries. Ground on the battery box/metal, not the
negative battery
terminal. Fortunately since you're right there, you can turn the key to
start, then
touch the + cable to the + terminal until your engine start then pull it
away.
bob

On Sat, Mar 20, 2010 at 8:40 PM, Mike South <msouth@gmail.com> wrote:

> Hi,
>
> I have the gowesty aux battery setup in my 85 Westy AT.  I think my starter
> battery is dying, but I just put in the aux battery and it's fine.  We just
> had a cold snap here and the van won't start.
>
> Is it safe to start it by hooking jumper cables across from the aux battery
> to the starter, or will that fry the system that is keeping them isolated
> at
> all the right times, etc?
>
> mike
>