Fuse block gets it's power from the BATTERY CABLE side of the starter relay,
NOT the 'I' terminal.
The 'I' terminal provides current to the ignition coil during cranking...
The relay has to be energized before the 'I' terminal is 'Hot', so it can't possibly deliver current to the fuse block.
The Primary wires for both the Fuse Block and the Alternator should connect to the BATTERY CABLE side of the starter relay,
You should use a fusible link between primary wires and battery cable terminal...
This will tell you how to build your alternator/charging system harness,
Using the fusible link in the proper place.
The 'Green & White' striped thing is the GROUNDING POST
Which is usually a 1/4" or 3/8" BRASS BOLT running up through the fender.
It's there to attach all your needed grounding wires to so everything gets a dedicated ground.
This will give you an overview of how to hook up the two wire connector, and what part numbers/sources for the parts...
Do the same fusible link thing with the wire that feeds the Fuse Block,
ADD A SECOND FUSIBLE LINK TO THE BATTERY CABLE SIDE OF THE STARTER RELAY
Then connect the fuse block to that fusible link...
The circuit should start with a fusible link at the starter relay battery cable side...
The 'Hot' wire from the battery cable MUST BE PROTECTED on it's way to the fuse block, or you run the risk of a fire!