measure out the wire that will go to the power source (usually the red one, you may have to extend it by adding more wire to it).
example if you attach the wire to the battery; place the wire near the battery and stretch it out to the license plate.
get your switch and find where youd like to mount it. clip the wire in two; somewhere near the switch.
the switch will have two little metal pieces on the bottom; attach one of the wires to one of them and the other wire to the other one. then just attach the wire to the power source and figure out what position the switch has to be in for the light to turn on.
ill try and post pics of how i did my strobe switch and the switch for the power inverter, so you can get a better idea cuz i suck with describing directions
:o
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