A really basic question

Yep C100 = Fuse Block Bulkhead.

The diagram on that one is (if I remember right off the top of my head) the engine bay side. If the plugs are off, it would be the female end. The numbering system on that is still weird to me.
 
When you're looking at a schematic the wires are colorcoded and the bulkhead connector with have all the wire terminals numbered for reference ...
 
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