Hi, I have a 94 80 Cab with a non working aerial. I have taken the aerial out and want to bench test it but I can only find 2 wires which go to the motor, a live and earth. As far as I know electric aerials require a trigger wire but I cannot see any other connections. Can anyone tell me how to test this unit. Am I missing some other wires and/or what triggers the motor. I don't get it. Many thanks in advance. Motor model number is 8G0 035 509A Rich