Coincidentaly, last night I installed a stero in my mother's '88
non-syncro Westy.  There was one main wire to each of the four speakers,
and one ground to each.  One ground was solid brown, the other three
were brown with a coloured stripe.

The main lines were, I think, as follows:
Front Left: Blue
Front Right: Red
Rear Left: Red/Green?
Rear Right: Blue/Green?

On a seperate plug (power plug I assume), were five wires, I used two:
Red+ and Brown-.  Not sure what the other three were for.

If you want I can confirm the above when I look at it later tonight.
Hope this helps.

--
Bob Norman
'81 Westy
Gander, Newfoundland
Canada
Everyone thinks I'm psychotic, except for my friends deep inside of the
earth.