Signal Dynamics Plug & Play Headlight Module Now there is no need to cut or splice wires in order to install a headlight module on your bike! With the Plug & Play Headlight Module, simply select which harness is needed for your bike, then plug it all together! Toggle Modulation ON and OFF: The modu When the bike is started the default is modulation ON. To turn the modulation on or off simply switch your bike's high low beam switch to the opposite position, and then back to the original position within one second (this can be done with the switch in either the high or low beam position). Auto Night Shut-Off: The Diamond Star&trade; Plug & Play Headlight Modulator is designed to automatically turn on and off at specific light levels in order to comply with the DOT's regulation of no night time modulation. To Switch From Max to Min Mode: The Diamond Star&trade; Headlight Module is equipped with two levels of modulation to meet your visibility requirements.