Does the starter relay 12v battery post need 12v?

^^ On my way there. Rough plan is to have all charging through the 2ga wire with the 95A fuse. Still don't understand these high output (amperage) alternators with a tiny *** charging stud.

Nothing coming from the starter solenoid or through the ammeter and as little as possible on the starter relay 12v stud.

There is a single 10ga feed to the main Painless fuse block and I've taken a lot off that circuit already ie: crackedbacks headlight harness, the fan controller and fans, stereo preamp, power seat, etc. I'll feed it off the bus bar with a 45A fuse and that should do it..... I hope... lol.