[MrFlippant]

As long as you don't connect the red/black to the guide, and green/yellow to the motor, you're fine.

Green and yellow can be either side of the guide. It's AC, it literally doesn't matter. If the car acts wonky, and you've ruled out all the normal stuff (lack of ferrite men on both ends, proper braid formation, clean rails, etc), then swap the two and see if things improve. In my experience, the only time this mattered was with some versions of third party chip firmware. Never with OEM chips and the firmware they came with.

Red and black to the motor is always a coin flip. Take a guess, and then test it before you put the body back on or spend time on other things like making the wires the perfect length or whatever.