Heater fan stopped working?

I have checked blower, relays, switches and all are good. I have looked and noticed that the HTR fuse is missing a prong for the fuse and need to trace the wire so I can just put in a in-line fuse. If somebody knows the 2 colors for that exact fuse that would be great. With winter right around the corner I need the heat. Thanks for your time if you can help.

The hot on the blower is purple. I tested the blower at 12v and each relay and all functioned properly. It's the fuse board that is missing 1 of the prongs for the fuse blades to go into it. Is there away to hook up to a toggle for blower and still get heat? And it is the digital control module. Instead of the slide controls.

Thanks a lot. Now with manually running a switch it will still warm up like normal right? And would the low, medium, and high settings work or would it be on high constant?

Heater problem
1992 Chevy Cheyenne 6 cyl Two Wheel Drive Automatic

Blower motor wont turn on. Have replaced the motor, resistor, the switch, and the fuse and still no blower motor.I cant locate or know if there is a blower motor relay if that is the cause. The pickup has no A/C heat only.

How does one check the fuse circuit? I have no power to the fuse that I can tell using a Fluk 80 mutlimeter.
But upon checking I have no power to the windshield wipers yet they work. What voltage should I have at the fuse anyway?

I have continuity from the fuse to the blower motor.
The fuse is good too have continuity across the fuse.
It almost acts like there is no power to the fuse box.

So I have replaced everything in the wiring diagram provided by JDL and still no blower motor. What could be causing it to get no power to the fuse box?

Thank you!