I also went through the "dance" a month ago:  replaced ignition switch with a one from Napa, then a Meyle, then a Kostal.  In my opinion, the Kostal brand is superior.  But like Roy, the problem was the starter NOT the ignition switch.

Mechanic started motor 6 times in a row in rapid succession; on 7th and 8th try, no crank; on 9th try it started.  He said, "Bad starter".
And it was.

      From: Roy Nicholl <RNicholl@NBNET.NB.CA>
 To: vanagon@GERRY.VANAGON.COM 
 Sent: Tuesday, September 27, 2016 4:48 AM
 Subject: Re: No start, (no crank actually)
   
Don,

The pump comes on when you first turn the switch to on.  Does it kick-in again when you try to crank?

Try jumping the circuit either at the switch or at the starter just to be sure.  Also measure your voltage - and if you can, amperage when trying to crank - at the starter.

I just went through this dance a couple of months ago and it was actually the starter and not the switch.

> On 27-Sep-2016, at 03:42, don spence <dkspence@TELUS.NET> wrote:
> 
> Turned the key, idiot lights on, fuel pump whines, no starter. Hold and nada. Tried several times with the same result. I'm thinking ignition switch again. Anybody suggest where to get one that will last more than a year?
> Thanks