OK - there are 2 red wires on the key switch
with power on the red wires turn the switch on and check for 12v on the red wires with the white stripe (two go to same terminal) - if there is not 12v on the red/wht wires then chase the red/blk wire #22 - either the circuit breaker near the battery has failed or the problem, is at the connections of the LH handlebar switch or the RUN/STOP or OFF/ON is not in the on or run position.
Let me know what you discover and when you have power on the red/wht wire.
Wire #22 goes to the main circuit breaker located near the battery where it splits into wires 32 and 52 (continued below)
In case you are wondering; wire #20 from the battery goes to the rec/reg where it turns into wire 21 - 21 goes to the key switch where it splits into wire #45 (not an issue at this point)
Wires 32 and 52 run parallel to the LH handlebar switch - when the switch is in the RUN or ON position, it feeds red/wht wire #24 - #24 goes back to the key switch where it splits to wire #23 - wire 23 feeds all the DC powered circuits.
For testing unplug the key switch and jump red to red/wht - if things power up, you can jump red/wht to wht/red to check the starter circuit.
Keep me informed of you progress.