white - will come from the side lights - if you have a switch for your rear fog you can take the supply from the 12v feed, as it only works when the sidelights/headlights are on. black - any metallic non painted surface, you will see earths dotted around behind your dash! orange - permanent 12v supply - like said above, cigarette lighter, or any constant 12v, and use a voltmeter or multimeter to find the correct wires