David:
It appears you might have a six volt wiper motor. 12volt motors have
five wires.
On the twelve volt uinit, the black/brown and black/red leads are the
high and low speed inputs. The remaining three wires are used in a
"parking" switch/relay setup
Six volt motors are single speed, one wire is power in, and the other
two are for the "parking" feature.
The six volt motor can be used with a voltage dropping resistor, but
the speed is slower than that of the twelve volt unit.
Any VW parts house has the required resistor.
Driving in the rain is not that much fun anyway.
If I can be of any further help.....
Good Luck....
Leon Chupp.
