The two small wires are for the solenoid that moves the cutoff shield. That's what gives you the high beam. If you get the Motocontrol harness it's plug and play. The reason you need the harness is when you turn the high beams on it shuts off the low beam. Well if that stayed like that then the shield would flip to provide a high beam, but the bulbs would shut off. So the motocontrol keeps the bulbs powered and flips the cutoff shield to give you high beams.