Power from the light switch goes to common on the dimmer. The wires(2) then go to the headlights. It wont matter which goes where as the dimmer switch is two position. Just make sure they are wired the same at each lamp(yellow from each to one wire, white from each to the other). If you got lights in one position of the dimmer but not the other, you got the common terminal wrong.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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