Battery Junction Box (Internal)
Could you post 13-8 Battery Junction Box?
I'm tracing an issue on my daughters 2005 Focus. No switched power to fuse F1.3 for heater blower as shown on 54-1 that you have posted on page 3.
My thoughts are its tied to a Buss bar or C1054 ignition relay.
Before I split the lower plastic section of the battery junction box to investigate, a wiring diagram would be handy to sort through the mess of spaghetti.