The vanagon had common ground speaker systems only through 1986.  This
was discussed extensively in a thread last October with many people
reporting what system was in their vans of various years of
manufacture.  The consensus seemed to be that 87 was the first year
without the common ground system.   I don't think any major
manufacturers make common ground systems anymore.

And Mark Drillock supplied the seemingly definitive information writing:

"The shared rear speaker ground appears to me to have ended with 1986
models. I own 2 1986 models with shared grounds and 2 1987 models with
separate pairs for each rear speaker. The Bentley wiring diagrams show
1986 shared and 1987 on separate. Pages 97.193 and 97.196, latest
version of the vanagon Bentley."

My 84 and 85 both had common ground while it was not present in the 87
parts van.

Sam

--
Sam Walters
Baltimore, MD

89 Syncro GL
85 Westy Weekender
84 Vanagon, original owner, soon to be retired, just too many problems

All incoming and outgoing email scanned by
automatically updated copy of Norton AntiVirus.