Does anyone have a link to a diagram, or the ability to sketch one from an abundance of knowledge, of all the wires/cables coming through the firewall?

I'm brand new, just took possession of my dad's '46, and it's had a number of mods done on a shoestring (3 colors of wires at a run sometimes) over the years that I would like to tidy up, plus I just need general knowledge.

I searched the forum but couldn't find such a diagram, so I'm sorry if I just missed it.

Any help provided is much appreciated.

1946 Chevrolet 1/2 ton pickup - bought from my dad, who's had it since he was about 20.