On Mon, 13 Feb 2006 12:11:02 -0800, Loren Busch <starwagen@GMAIL.COM> wrote:

>Now comes the mystery.  The new radio has separate ground wires for each
>rear speaker, the old one didn't.  No place to match up and connect the rear
>grounds for the new radio.

Loren,
Your 1990 Van rear-speakers do have separate grounds if, they are still original. Perhaps the
previous installer twisted the grounds together (somewhere?) to match the common rear
grounding of the old head-unit. Now to locate where that connection is hiding?

The wires for the rear speakers can be located behind the Glove-Box where the radio speaker
loom splits between the Pass-door-speaker and the 2 rear-speakers (6 wires into 4 & 2). The
color code in your Bentley will give you some help here.

Good hunting....

Phil Z.