>Intermittent/occasional loads (indicators, horn and brakelight) are not added in to calculate the fuse rating,
"moe" the OP and any other reader is welcome to test this theory. First rewire I did, I believed it too. Testing, I turned on the indicators, pressed the horn button to test that and the fuse blew. Nope, nothing wrong with my wiring.
In reality, no such thing as an "Intermittent/occasional load" in town/city riding.