Last year we bought new helmets(GMAX 67S) for the trike. For christmas, I bought the Brake light kit for my wife's helmet.(jw 168 from GMax) Kinda neat little extra, never enough brake lights. Simple little drawing to attach the transmitter to the brake light circuit. Rather than remove the seat, I'll attach the transmitter to the brake ligh circuit in the trunk. Carefully unpluged the wires and attached the transmitter and put everything back in place. this transmitter has an indicator that lights when the brakes are applied, neat! Now to the problem. When I turn on the Ignition the light comes on. After further checking the positive is on all the time but the brake lights are not on. the transmitter does not work. after more checking I find the voltage with ignition on is only about 6 volts but when brake are applied the voltage goes to 12v. After more checking I put a test light to the wires and the light is dim till brakes are applied then goes bright. When I hook the transmitter to the battery it works fine. So I hooked the transmitter back to the wires in the trunk with the test lite attached and with the load of the test lite in the circuit everything works. It seems that I need a small resistor in the circuit to make things work. Does anyone know more about this??