Trying to put some older MRC AD310 decoders into a couple of old Rivarossi steam engines. I hook up the orange and grey wires to the motor and the black and the red wires to the pick-ups. Im using a Prodigy Advanced system, and then I will program the engine but nothing seems to happen. Then when I put the engine on the main and it just takes off with no control over it. Am I not isolating the engine or wiring it wrong? With the other engines I have done(with different manufactures decoders) I could hear a faint buzzing noise coming through the decoder, but with the MRC decoders I get nothing. Any help would be much apperciated. Thanks, Rob.