New ignition and fully charged battery
With a test light, ground the alligator clip, the ice pick probe goes to any wire that lights the light at the key switch:
a. Light goes on, it's not a fuse.
b. Light is not showing hot to any wire, then go back to the fuse.
c. Battery to fuse. Fuse to key switch. Key switch out to other wires... Follow the source out from the first jobber [fuse] from battery. Fuse shows good, then it is a break in the wire from the fuse side out to key switch. You sort of walk each connection for some insight as to how it flows out of the battery.
... turn key and nothing turns on - no lights, nothing. Just need a little insight maybe where to start looking?
What was the last thing you did before it ran is the question, right? 'New ignition' is what? New spark box, new cam sensor, new ignition switch, new ignition coil?
For the power to be shut off with any ignition change, hard to believe a plug and play shuts off all the lights. Was the battery charged on the bike or battery out of bike? Then as mentioned, a main posi side wire off the battery post is a possibility of not being hooked back up:
a. With test light, you want to pick the farthest eyelet away from the posi (+) side of the post of the battery, then stab the pick into the other side of the posi leaded post and see if the test light comes on?
b. Do the same with the neg (-) cable, [key on] then jump over to the lead side and see if cables to battery posts have that flow out to the main wire harness wires at the battery. But this time, alligator clip goes to key switch wire say. Or to the fuse with a sewing needle touching the exposed metal at the top of the fuse. Alligator clip to ground testing both [neg] cable to lead won't show the transfer remember, right?
Make sense test light wise?