Thanks all!

As per everyone's excellent advice, I peeled back the rubber boot to the
door and found....TA-DA!  3 broken wires.  Black, Black/Yellow and
Green/White.  I got the up and down part of the power mirrors (both
sides) fixed, but not side to side before I had to give up and go in the
house (it was snowing pretty hard, and I cut my thumb - hey, I know when
to give up!).

So there are a total of 8 wires running into the door.  The three
mentiond above, a blue & brown/red combo (for the speaker) and I assume
that the other 3 are for the power mirrors (since there is also a L/R
switch in there, it requires more wires I guess).  I'll have to go out
and check the other wires I guess to make sure there are no more breaks
(to get the side to side adjustment working).

Thanks everyone for their advice and suggestions!

Keith
Calgary, Alberta, Canada
1986 Vanagon GL Westy - 254,000km and counting