Everything but headlights

[Toro]

I've been working through all of my lights on my '72 and I now have everything working except the headlights. I can make them work if I jumper 12v from the fuse panel to the plug on the dimmer switch, so I thought it was that switch, but I jumpered across that connection and still nothing. I don't have voltage going g to the dimmer switch. I have replaced the main headlight switch, and the run lights, panel lights, brake lights, blinkers all work. I know the headlights themselves are good because they turn on when I jumper 12v to the plug at the dimmer switch. Does power normally come from the headlight switch to the dimmer switch and then to the headlights? Thanks