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Date:         Sat, 26 Mar 2011 18:35:06 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Alternator question
Comments: To: Scott Daniel - Turbovans <scottdaniel@turbovans.com>
In-Reply-To:  <0c5001cbec03$6debfb70$6401a8c0@PROSPERITY>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 06:16 PM 3/26/2011, Scott Daniel - Turbovans wrote:

>why is the blue wire D + tied into the Oxygen Sensor elasped milage >counter box and light .. >and why does it say 'cat elapsed milage counter' at the box, track 46, >page 97.107 ?

Short answer is that the switch at track 46 (that's the box under the van) will light the OXS light when it trips, by grounding its negative lead. But *also* the wire at track 45 dives into the fuse/relay panel on plug C, comes out on plug A at track 44 where it's referred over to track 50. There at the plug B connector it joins the D+ wire heading from the instrument panel back to the alternator. This whole charade is for a bulb check - any time D+ is grounded and lights up the ALT light, it will also light up the OXS light. If you haven't noticed that this happens, goes to show how good people are at noticing things they see every day (or that they drive an '89+ which doesn't have an OXS light).

The diode inside the switchbox at track 45 is so that the OXS switch won't attempt to mess with the D+ line when it trips: D+ can pull OXS low, but OXS cannot even try to pull D+ low (which it could have trouble doing if the alternator were charging, could be some magic smoke let out there somewhere as well as a false ALT light. Which might no longer be false if the magic smoke came out).

Yrs, d


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