there are only 2 wires going to the motor, I think they are green and black, but if you remove the door panel (follow DG's pictorial on that if you've never taken a 123 panel off) and you will see two screws near the hinge area with the motor wires on them, follow those to the dash area. odds are good you'll find the broken wire.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!