The y-axis servo in my KM3P died. I bought a used one off eBay and hooked it up. Immediately upon powering up the machine, the Y-axis goes into runaway in the negative direction. It bangs into the limit stops and bounces there until I turn off the power. Upon closer inspection of the wiring in the servo's junction box, I can see that the heavy red and black wires (pins 1 and 2) are reversed in the replacement servo. It is as simple as reversing the red and black wires to correct the problem? I can't say that I fully understand how servo motors work or even if they are AC or DC. I've seen some chatter in other threads about reversing the Channel A and B (green and blue?) wires when a motor is internally wired backwards from the original but I don't see "green and blue" wires in the junction box nor do I understand what "channel A and B" are. Can someone suggest a solution? The servo is a Hurco/ElectroCraft E26-2 part number 727-902-0767.Any help would be appreciated.