Nacho - I don't think I've seen one you've done with ignition circuit.
Every car is a little different so I needed to make a detailed one for mine anyway.

Quote:
10 gauge on engine bay side ( between bulkhead and fuse link ) for red one, but still 12 on cab side. I just talked about cab side because engine bay side looks still in good conditions. I don't get why 10 gauge just in that section

Maybe the larger size is to account for heat in the engine bay.
From the Battery to the Relay makes is probably because it supplies current to the relay at the starter solenoid.