Date:         Fri, 25 Jan 2013 21:50:29 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Ignition Switch "Su" Power
Comments: To: Scott Daniel - Turbovans <scottdaniel@turbovans.com>
In-Reply-To:  <51034011.2010908@turbovans.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 09:31 PM 1/25/2013, Scott Daniel - Turbovans wrote:
>if I may ..  ( yup ..an engine conversion vanagon )
>I believe the orignal conern or problem had to do with drawing too
>much current through the black 15 wire on Neil's van.

Standard water-cooled method is to use two relays, each powered
directly from the B+ (30) circuit of the alternator by way of the
terminal post inside the connector box on the firewall.  The first
one is controlled by ignition switch circuit 15 to power the ECU, and
the second one is commanded from inside the ECU to power the fuel
pump.  Thus the 15 circuit wire going to the rear only has to supply
?200 mA? to that first relay to operate it, along with a few amps
intermittent for the coil..  The rest of the ECU/fuel pump power
comes straight from the battery.  I looked at the '83-4 drawing but
the rest are similar.

Yours,
David