Correct.
Note that left and right are the same control, just that it is stacked, with two rows of contacts.....
So (for now) you only need to power the right hand one in the illustration.
If you look at the blower resistor you'll note a thermal fuse.
Be certain you have continuity through the resistor block before you pull your hair out.
AC and heat only trucks (like mine) have different configurations
If you can't match the colours shown in the diagram, I'm going to suggest you just ohm out the pins to determine which of the three is what speed.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.