It only takes 3 wire to drive the mirror motor. 2 with one being a neutral all directions---up and down or 2 using the remaining wire for right to left with polarity changing at the switch for any direction change. 3 for the right mirror and 3 for the left mirror. The other 2 wires are going into the switch are for a ground and power. Some of the switches may have a different approach but you should be able to figure out the polarity change. We had to build a relay for the original GT5-S switch to be used with the Colt mirrors. I should still have one with the wiring diagram.