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Date:         Sat, 14 May 2011 19:32:51 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Voltage at alternator blue D+ lead?
Comments: To: Poppie Jagersand <poppie.jagersand@YAHOO.CA>
In-Reply-To:  <466178.30759.qm@web45314.mail.sp1.yahoo.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 07:01 PM 5/14/2011, Poppie Jagersand wrote: >My alternator is not charging. After various tests I found that the >voltage on the blue D+ wire to the alternator was 5V. I looked in >the alternator trouble shooting section in the Bentley manual. It >doesn't list the D+ voltage. Isn't it supposed to be 12V? Could >something be loading it down? (I already disconnected the fridge >relay which I believe also runs on this circuit.)

It won't be +12 until the alternator starts charging. I can't get to mine now to check the voltage but +5 seems not unreasonable. Pending someone coming up with an actual reading, if your ALT light is the same brightness as usual then I think D+ is probably ok (when it does come up to [charging voltage] the ALT light will go out; in the meantime there's a resistor parallel to the light which is supplying maybe 100 ma to that terminal to allow the alternator to begin charging).

Yrs, d


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