VFR won't start!

Hello all, my 2001 VFR sadly won’t start anymore.

TLDR: After ignition on, no fuel pump noise and 20A associated fuse “B” blown. Blows again immediately after replacement + ignition on. Removed the downstream Engine Shutoff Relay ESR and Fuel Cut Relay FCR and measure 0.1 Ohm (short) of black/white wire against ground. No FI light flashes.

Questions:

1. Can you confirm this is my problem, black/white wire should not be short to ground?

2. I disconnected what I easily could from the myriad of black/white wires but still 0.1 Ohm. What should I do next?

Add’l info: There are MANY items on the black/white wires of the harness per the schematic. Disconnected all ignition coils, ECU and some other items accessible after removing all fairing but haven’t dug in enough to disconnect injectors etc. I also saw someone showing the blue patch connector which includes black/white wires – where do I find that?

I’ve read several threads on similar issues with resolution often being poor connections including to ground but I seem to have the opposite problem. Good chance some insulation has been chafed off and is touching ground which I think can be a bear to find with so many black/white wires. Someone recommended (an earlier version of) “Power Probe 3000 Circuit Tracer for Shorts and Opens” and I may spring for that; any opinions on that?

I suspect the following are unrelated but figured I’d mention them: Just before this happened, switched out the 16t front sprocket for a 15t where you have to remove the speed sensor. Replaced R/R with SH847 a couple months back. Also wired heated grips + USB power to front harness next to headlights.

Thank you all!

(Picture for attention. Philadelphia City Hall in background)