On the campers, the ground for the fridge relay is through the starter
solenoid. Sometimes there is enough back feed to keep the light off while
cranking. This is a bit of overkill but basically it keeps the fridge off
during engine cranking and if the alternator should fail. As the fridge
relay also loads down the alternator warning/starting circuit that back feed
helps get the alternator going just as the key is released.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
David Beierl
Sent: Monday, May 24, 2010 3:30 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Alternator light mystery

I just experienced a minor mystery with my Alt light.  I turned the
ignition on without paying attention but got distracted before
starting the engine.  When I looked to start, that Alt light was not
lit.  I went ahead and cranked, and the light lit briefly then went
out as the engine started.  Subsequent operation (five or six starts)
has been normal.

I shall reveal the trick as and when I discover it...

David