Date:         Sun, 18 Jun 2000 23:09:32 EDT
Reply-To:     kenneth d lewis <kdlewis@juno.com>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         kenneth d lewis <kdlewis@juno.com>
Subject:      Re: Alternator output wiring
Comments: To: stanman@blueneptune.com

Stanely;
        Good find! I never would have suspected it but it makws sense. If
the alternator fails the relay drops out and seperates the 2nd battery
from the main.

Drive Safely & Good Luck
Ken Lewis    <Kernersville,NC>
86 VW crewcab;60 356B Coupe
--------------------------------------------------

On Sun, 18 Jun 2000 10:02:38 -0700 Stanley Pitman
<stanman@blueneptune.com> writes:
>Hey Larry, Bill, Beckett etc.
>
>I've done some digging into connecting 2nd-battery relays, possibly at
>the
>alternator's "output".
>
>If you look at the alternators and their electrical wiring diagrams
>closely, there are TWO alternator outputs, marked B+ and D+ on wiring
>diagrams.
>
>The main output B+ is directly wired to the battery positive, starter,
>etc,
>as pointed out by Larry.  No battery current flows back into the
>alternator
>because it has rectifying diodes inside.  Their main purpose is
>changing
>the alternator's generated AC power into pulsating DC power, similar
>to
>what commutators and carbon brushes did for generators in
>pre-alternator
>times.
>
>The auxiliary D+ output serves to drive the alternator lamp and to
>drive
>the Westy's auxiliary battery relay.  A-HA!  This is clearly shown in
>my
>Bentley book in the camper wiring section.
>
>Hope this removes some of the mystery, for all of us.
>
>Stanley

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