A noob trying to learn more about his car

why would there be dirt amongst my wiring?..

---------- Post added at 09:56 PM ---------- Previous post was at 09:53 PM ----------

and no worries I did download the FSM and the manufacturers manual.
I was confused cause the red 12V was connected to the blue.

Ok so I’ll just leave the fuse in there, can’t hurt.
Thanks!