Just reading some of the other comments too, re the Red Yel and Blk wires Perhaps there may be a 12 volts solenoid in the shower head in case someone in that house takes too long showers? remote shut off via the home computer? or an hour meter flow switch to check the time its used for?? You see a photo sometimes but you need the full story too.
The product of rotation, excitation and flux produces electricty.
