Denali Trigger Wizard Universal High Beam Trigger for Ground Switched LED Headlights [DNL.WHS.20600] Sharp Visor CHIN STRAPE: Double–D ring strap and lasting reliability for CHIN STRAPE: Double–D ring strap When the circuits are flashing you can dial up or down to select your desired fuse value simply connect the white and blue ends to the color coded DENALI wiring harness trigger wires and then connect the black and white leads to the vehicle high beam and switched power wires respectively To tell what kind of switching your vehicle has simply use a voltmeter to measure the voltage on the headlight high beam wire as you toggle the high beam switch on off