On 10/15/07, Kai Mei <kai@newclear.us> wrote:
>
> i'm going to use a stancor relay and heavy wire (0 or 2 ga) and I'd
> like to know how to parallel the batteries only when the ignition is
> on AND alt light is off which I haven't seen how to do in my research.
>
> The van currently has zero wiring in the aux battery area.

The quick and dirty way? put the + of the relay coil on the alternator blue
wire (12v when alternator is working) and the - of the coil on the starter
solenoid (12v when you turn the key to start). This will connect the
secondary battery when the engine is running, but not while you are cranking
the starter.

--
John Bange
'90 Vanagon - "Geldsauger"