Pickie of the T plug on the battery, All of my bikes are wired likr this so the battery terminals can be painted over with Liquid Electrical Tape so there is no more corrosion & my wires get a full 6 Volts.
This is where I fitted the fuses finally and to date the only time I have gone there is to donate a fuse to a latter model battery ignition bike rider. Sitting where they are no one has ever noticed them. The fuse holders are tie wrapped to an 8" length of steel flat bar that simply drops down into the frame cavity
The fuses are on both power wires, the battery & the A wire from the rectifier.
And being where it is there is only a few inches wire between the fuse & the rectifier.