John, this is an easy one. It's one of the two brake light switches. You can unplug to determine which. 

Jim

On Aug 24, 2011, at 12:13 AM, John Rodgers <inua@CHARTER.NET> wrote:

> I had this problem with my project van - '91 Carat. But I didn't
> pursue it because the van was not otherwise ready for the road. Now of a
> sudden my #2 1988 GL started this nonsense today. Brake lights will not
> turn off. Since the van was stored for 10 years, I am assuming brake
> light switches. Are there any other possibilities  I should investigate?
> 
> Thanks,
> 
> Jhn
> 
> --
> John Rodgers
> Clayartist and Moldmaker
> 88'GL VW Bus Driver
> Chelsea, AL
> Http://www.moldhaus.com