Go to the Simrad website and search for the WP5000 owner's manual. It will describe what the wires are for. If I recall correctly, red and black are power inputs for operation with the control system compass, and the other two are for inputs from a wind vane transmitter.
I've just been given a unit that came off a Hunter 340, and it has only the black and red wires, so I assume that the previous owner did not have a wind vane tied into the system. I haven't tried to install it, so I don't know the answer. However, if you get it to work, please post what you did.
Last edited by NCC320; 07-14-2009 at 06:11 PM.