I don't have power windows, so no specifics here... but from general
electronic experience, I'd suspect the switch on the driver's side (it's
mechanical, subject to wear, and probably been used a lot more than the
passenger's side switch).

Next, I'd check the connections to that same switch... connectors are the
weak point in any harness, since they are subject to corrosion/crud buildup
over time.

If you can swap the switches without too much trouble, try that and see if
the problem moves.

At 12:22 PM 4/27/2004 -0400, Tom Miller wrote:
>My 89 Westy has power windows.  When I operate the passenger window from the
>driver's seat, the window moves very slowly, like it is running on 5 volts
>or something.  It seems to work OK from the pasenger seat.  Where should I
>look for the voltage drop?
>TEMiller
>
>----- Original Message -----
>From: "John Runberg" <jrunberg@MAC.COM>
>To: <vanagon@GERRY.VANAGON.COM>
>Sent: Monday, April 26, 2004 10:04 PM
>Subject: Re: Any easy, low-cost way to replace power window lift with
>manual?
>
>
> > > I'm tired of screwing (diagnosing/repairing/replacing) with the
> > > multiple failure modes of the power windows on our two Vanagons.
> > Did this to the Carat about a year ago since I'm not a fan of power
>windows and the driver's side motor was trash. Process is simple: unbolt,
>remove (once you figure out how) and the manual pieces bolt right in. I sold
>the regulators and the switches but left the wiring in the doors. A friendly
>list memeber (local too!) sold me new door panels which were similar, but
>had different trim. Biggest thing was getting the stupid power regulators
>out! I found it's similar to learning to roll a kayak -- on paper it makes
>no sense, but once you 'get it' it's the simplest thing ever.
> >
> > Keep in mind that the resale on the van will drop and that the regulators
>are worth A LOT of $$ if they're in good condition.
> >
> > john
> >