It's been  year since I got it, but I purchased a module that converts the separate turn signal light & brake light into the trailer lighting that uses the same wire for brakes and turn signal.  I think I paid around $25 for it.  I just did a quick search and the link below shows something that is about the same thing.  You can probably pick one up at your local parts house. 

http://hitches4less.com/motaco.html 

David Wilhite 

84' Westy 

Middle TN 

  
----- Original Message ----- 
From: "Rob" <becida@COMCAST.NET> 
To: vanagon@GERRY.VANAGON.COM 
Sent: Saturday, March 28, 2009 10:25:00 PM GMT -06:00 US/Canada Central 
Subject: Re: Auxiallary Brake Lights - Was Carrying Scooter 

At  3/28/2009 06:46 PM, David Wilhite wrote: 
>   Since I already had installed trailer lighting, I just tapped 
> into it, so I have turn signal and brake light functions. 
> 
>David Wilhite 
> 
>84' Westy 
> 
>Middle TN 

How did you deal with the brake lights? 
I hooked up a standard 4 pin trailer connection on my '84. The 
ground, right turn, left turn and running lights. 

Rob 
becida@comcast.net 

'91 VW Jetta & an '84 Westy in western WA