The wiring diagram below shows what you need to end up wiring to make this work, so if you know how to read a wiring diagram and feel like "skipping ahead", just go click on the thumbnail for the wiring diagram and check it out in full size, full color glory. It's shown for a four headlight system - if you have a two headlight system on your car, pretend the two inner "high beam only" headlights aren't there and you'll be fine. The wire colors shown here represent a typical GM vehicle (the green and tan wires, along with some of the black wires) as well as the proper/correct/desired wire colors to use on any new wiring you do (the red and some of the black wires). Also, this is shown as a typical "Bosch style" automotive relay with the connections numbered as such. If your relay is not numbered like this, then just identify the wires by function and go from there. Note that in the original version of this diagram, I had the labels for the right side headlights reversed - it has since been corrected thanks to a sharp-eyed reader who pointed out the mistake to me. The wiring diagram was always correct, but the headlight labels may have been a tad confusing to some. Apologies for the mistake.
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