I had the same problem with my flashers and it cleared itself up somehow.
No fault with the turn signals or the parking lights or brake lights..just
the left side E-flasher not working front and back...Walked away and came
back...everything working...Huh?    must be the switch..I have another that
maybe I will swap in just for fun...
  Don Hanson

On Sun, Nov 22, 2009 at 12:39 PM, Allan Streib <streib@cs.indiana.edu>wrote:

>  Stephen Grisanti <bike2vcu@YAHOO.COM> writes:
>
> > I had occasion to use the flashers yesterday while jockeying three
> > vehicles among two parking spaces and noticed that the left (driver's)
> > side lights were not working.  Figuring the turns signals were out I
> > tested them and found both right and left side turn signals work, each
> > side blinking normally but not both together when in the emergency
> > mode.  Has anyone encountered this on his/her van and isolated the
> > cause of the problem?
>
> I don't know how they are wired but I'd suspect the flasher switch.  It
> is a switch that is rarely used, so it's possible that it has corroded
> internally and is not closing all the circuits that it needs to.
>
> Try operating the switch a few dozen times and see if the problem clears
> up.
>
> Allan
> --
> 1991 Vanagon GL
>