I did not build my RV9A, and am replacing the avionics. I pulled the seat pans to access the wiring in place, trying to figure out what wires do what. From the wing root into the cockpit, I have three unlabeled wires. One is to the fuel sensor, one is to the landing lights. I have another wire that I cannot figure out what it is. There is no heated pitot in the wing, it's not to the autopilot servo, and it's not the strobe bundle. It does not go the length of the wing, and appears to terminate in the root area. Any ideas?