farmall 560 project wiring question

The wiring harness hasn't arrived yet and I am going back to college sunday. Soooo... I'm going to make a harness tomorrow. Looking at the diagram it looks like three wires go to the rear light. One ground and two seperate hot wires from the switch. Why are there two hot wires and where do they go? their are only two terminals on the light.
 
One hot is for the feild light or white lite and the second is for the Red tail light . As there was a separate bulb socket that clipped to the one ground screw on the rear light that has the back of the bulbtinted red with a window in the back of the reflector of the bulb
 
I'm starting to understand the reason for three wires but i'm still kind of hazy on where the wire goes with only two terminals? one hot wire to each terminal and the ground to something else?
 
Depends if you have the orginal two light bulb or a replacement one light bulb.

Can you see any red inside the lense?

Gary
 

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