Date:         Sat, 25 Oct 2003 13:16:55 -0400
Reply-To:     Stan Harrison <sharrison@ALUM.MIT.EDU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Stan Harrison <sharrison@ALUM.MIT.EDU>
Subject:      Re: Vanagon Syndrome??? Curve is volts, not ohms.
Comments: To: Pat Callaghan <patcal096@COMCAST.NET>
Content-Type: text/plain; charset=us-ascii; format=flowed

   Pat,
    What I found when testing mine was that the wiper track is very high
resistance, with its intermediate voltages (not resistances) set by the
voltage drops across a lower resistance voltage devider. This setup
enables them to trim the voltage vs. angle slopes of various portions of
the wiper travel. But it means you will not get what you expect from an
ohm meter. But if you put 5, 9, 10, or 12v across the whole pot. and use
a voltmeter, you should see the smooth V vs. angle response.
     Stan
  87 syncro

Pat Callaghan wrote:

>      Ok,  Here is what I found so far.  In the picture you can see the
> tracks on the AFM carbon section.  I am not sure if that is too bad or what?
> When I hook my VOM to wire #2 & #4 I get very erratic readings.  There is a
> time if I go from idle to any section of the carbon, that the ohms will go
> to zero for a second then goes back to some reading.  It always does this
> from idle but never from any other throttle position.  I have no idea what
> is considered normal.  Any more ideas?  Thanks.
>
>
> Pat Callaghan
> 87 Westy GL
> Portland, OR.
> http://home.comcast.net/~patcal096
>
>