Just how dumb am I? (help me identify this wiring harness)

4 cables nicked, nothing completely cut. The smallest gauge wire was missing so much copper that I opted to cut it and solder in a bit of wire patch and heat shrink it.

Still really really mad at myself.

 

obviously you will or did check it to see if it works and no codes before you bundle it back up'
quite a job, you got yourself into quite a goat rope by just drilling a hole, LOL
something it would do, no LOL

 

Glad it wasn't more serious.

A trick that works well in these situations is to place a socket or 2 over the drill bit, fine-tuning its total length with some washers if needed. This lets the end of the bit punch through without the whole thing entering and damaging things behind the panel you're drilling.