I have this Atlas S-4 Model #8285 (PENNSYLVANIA Rd #8431) that I have been trying to install a DH126D decoder in... I soldered in a 9-pin plug, as per instructions (isolated motor)/ orange & gray to motor/// black & red to wheel pickups /// blue & white to front light (diode w/resistor).... It ran nice, so I installed my sound decode, two wires, to the wheel pickups, sounded good. Came back the next day "fired-up" the engine, SHORT warning came on. Checked wiring and everything else with ohm meter, no shorts I could find, but now I have no motor functions, light and sound still worked. put decoder in another engine no motor function-KAPUT!! Put in new plug & new decode...KAPUT!! Removed 9-pin plug and sound, then installed a Bachmann 44913 decoder (hard-wired)... Now as soon as I enter decoder address, motor bumps on for a turn, then system goes to SHORT... ANY ONE KNOW WANT IS GOING ON!!!!!!!!!!!