There are different styles of switches. No idea if yours is original. Here are a couple of examples. On the first, the headlight switch incoming would go to the bottom terminal labeled B, on the second the headlight switch would go to the offset terminal as schematically drawn. On the third, it would go to the top terminal with two rivets.
Most dimmer switches will have some kind of label on one terminal-- A "1", or maybe a "B" for bat, or "C" for common or with terminals riveted together (this top switch has both label and 2 terminals connected together) or else one of the terminals will be differently shaped & maybe offset from the other two. The bottom picture of a universal switch has no label I can see but does have two terminals riveted together.
Those labeled, riveted or different terminals would take the incoming from headlight switch. The two wires going on to the lights doesn't care which of the remaining they go on.
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