1973 Duster Heater fan not working

Tanker said
Most good schematics will label the wires with letters, numbers or a combination of the two so that the wire can be more easily traced through multiple pages or very busy drawings. The C5, C6, C7 etc are the labels. The other figure is likely a call out for the wire gauge. The numbers 14, 16, and 18 are common wire gauges with the smaller numbers being thicker wires. As you've already guessed the other letters are color call outs.

Thanks, this will help. So I traced the black wire and found it was also cut. on the fuse box, Heat Fuse, used an ohmmeter to track it to #12 on the pad behind the fuses and it's wire is purple. *ZOINKS* Anyways, I need to see where that purple wire goes next. :)