Widscreen wiper motor testing

[green A8]

As I stated in my intro post I've bought a badly neglected and somewhat damp 4.2 QS. One of the few things that totally refuse to work are the windscreen wipers. I've checked for blown fuses, no joy. There is no attempt at any movement of the wipers at all. I supect that it is the wiper stalk or a relay that is defective due to damp ingress from the flooded interior. Could anybody tell me where is the wiper relay located and which one is it? I would have thought that seized spindles or linkages would result in fuses blowing?

What I intend to do is connect a slave battery directly to the wiper motor. I've located the wiper motor and had it's loom plug apart, no sign of any corrosion present. Is there any particular wire that carries the +tive feed o the motor? I assume that the brown one is the earth, and therefore the -tive feed for the slave battery.

I look forward to hearing from the forums experts. Thanks for taking the time to read this.

Paul.