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I've converted one of Walthers Dash 8s (same wiring arrangement) - first you need to desolder the wires from the motor. Then, check that the motor is completely isolated from the rails - the Dash 8 has plastic truck frames and wired wiper pickups, so it's obvious the frame isn't live - not sure if the GP9 is the same. Connect the pickup wires together - front left to rear left, front right to rear right - these connect to the decoder's power feed wires (Lenz have a very good set of instructions packaged with their decoders, if yours is missing say so and I'll post a wiring chart from one of mine). The motor wires are then soldered the motor terminals, and all is good - the best way to check before powering up on the main line is to place the loco on your programming track and see if you can set and read back values (I use CV1, the address). If all works as expected, wrap some insulating tape around the solder joints (to prevent shorts) and refit the bodyshell. <br /> <br />Does the GP9 have directional lighting? If so, you can wire this to work under DCC too - I used the Lenz decoder function outputs (following their instructions) and put a couple of resistors in line to stop the bulbs overheating - not sure what value they now have but guessing about 300 Ohm, they get warm but don't melt anything and there's a good light output too. Hope this is of help!
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