<p>looking at the instructions for the 36120, I think you have wheel pickup wiring connected incorrectly? Brown and white (they're the feeds from the wheels, right?) should go to connections 1 & 2, in your photo they're in 1 and 3? You've connected one side of the pickups to decoder ground! </p><p> </p><p> </p><p> http://www.piko.de/36190-anleitungen/36120-90-7000.pdf </p>