When I brought it, it had a decoder already done but would not work so that's why I got a new one and I just copied the wiring,the wire's soldered to the motor terminal is were its supposed to be, on closer inspection the chassis block has already been cut back. today I will strip all down because even though it ran with the body off yesterday when i redone it there's a short with it now and I had to just walk away from it so hopefully today it will work.