Light Switch Wiring Issues...

I am wiring up a 1976 140 using a used harness from a 100 tractor. The 100 had the old style 3 position light switch, and I am using the later version 4 position switch because this tractor has the rear flashers.

The old switch had 2 wires hooked up to the same pole on one end of the dim resistor. Is this ok, or do I need to hook up 1 wire on each end?

Also, are these the headlight wires? Do these tractors have a seperate wire unlike the Cubs where they split off into two wires at the front?
 
Im thinking that the 2 wires that were hooked up on the same pole of the old switch may have been 2 different things. I am pretty sure the headlights do split off at the front and use 1 wire to the switch. I bet the other wire was for a tail light. But I'm really not sure.
 
I have not been in there for a while so I'm going on memory. The headlights definitely were one wire to the left headlight and then across the front to the right headlight. This wire went to one end of the resistor--on High the voltage by-passed the resistor and went right to the pin. The two wires on the other side should be the flasher and the tail light. That pin gets 12V+ on both D and H but not R (or O, obviously). Then one pin and wire for the rear bright light and one pin and wire to the fuse.

If I did a rewire and it were not a show tractor, I'd just start from scratch with some split loom rather than making the wrong old harness work. I rewired mine from scratch when I was 17 and I'm 55 now and my old work has held up better than those IH cloth harnesses ever did. Plus it was easier to upgrade to an alternator and put in high wattage headlights.
 

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