Bracket Car Wiring Help

Thanks! That’s why I’m doing this. I knew that diagram was just a ‘first draft’ but I needed to start somewhere as I have trouble visualizing, especially wiring.

I’ll work on a new one. So cable from rear of car to one side of solenoid. From that same side a cable to big post of starter. Cable from other side of solenoid to small post on starter?

If I have that part correct I assume I can still use the side of the solenoid with the battery cable to power the painless box and msd box? Or am I missing a step there.

Yes and yes! You can pick up power on the battery cable side.