No power at all, help with wiring please

So it's ok to bypass the bulkhead with this red wire? When I get home after work I will check it out.

I get a single click noise when I tried that once but usually nothing happens... What does that mean lol

Not only is it ok, but recommended as an electrical and charging system upgrade.
You can check it out here Catalog

The single click is either normal, a dead battery, a bad starter or the wires/connections in between the solenoid and starter. (my bet is starter if the battery charge is good)
The one click you hear is the solenoid closing to make the contact for the starter to turn the engine, but the starter isn't turning.

This still has nothing to do with having zero power in the car.
That is the red wire you circled in blue or somewhere along it's path to the inside of the car.

Follow it and find out where the connection is lost.
It's very likely lost right at the back of the amp meter, and connecting the two wires on the back of the amp meter together is part of the MAD bypass.
If this has been done already the red wire will be connected to a same size black wire right behind the amp meter and you want to then follow the black wire till you have a power loss.