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It always helps when the person asking questions is open to taking advice rather than arguing over it.

Many (most) draw the power fron that 12V block on the firewall. I did on one truck. On the other I ran a dedicated 10GA wire direct.

I covered that missing wire in post 6. I drew an orange line in the pic. That feeds all of the 12V for the cab.

To help give a little better understanding, have a look at the pic attached. The 12V block on the firewall (circled in blue) normally has a red wire with a fusible link running to it. It follows the orange line and attaches to the battery cable that goes from the positive of the front battery...