To keep it simple there are two part numbers.  251941531M for vans built up
to 90 with a VIN that has an M for the year and 1000 and less as the last
four digits.  If you have the M VIN (90-91) and 1001 and higher last four
digits then you are in need of the 251941531T switch.

Does that clear this up for you?

Ken Wilford
John 3:16
www.vanagain.com

On Thu, May 16, 2013 at 10:41 AM, Loren Busch <starwagen@gmail.com> wrote:

>
> RE: Headlight Switch
> Ken, not trying to challenge a guy who stocks and sells this kind of stuff
> for a living, but are you sure that it's both '90 and '91 and not just '91
> that has the extra pins?
> Second, when the headlight switch on my '90 went out a few years ago I
> replaced it with an older switch out of the used parts bin at my local VW
> shop and it's been working fine for many years now (relays added).
> And third, do you know the part numbers for the different switches?  At
> that time we looked at the part number on several headlight switches and
> found several letter suffixes on different switches.  Two different
> switches with different numbers (and IIRC different pins) seemed to work
> just fine in my '90.  I put in one with the same suffix that had been in
> the one that went bad.
>

--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com