Edited Date/Time:
My 2017 KTM 450SX-F lost all electrical functions including starter, fuel pump, solenoid, etc. I'd hit the starter button and not even a "click" or cycling of the fuel pump or anything. Battery is fine. Traced it down to the ground strap off the battery to the subframe had NO continuity. The grounding strap subframe mounting plate welds had broken so there was no ground for the entire electrical system (i.e. it was an open circuit). Fixed the broken welds, reattached the battery ground and once again all is good.
What puzzles me is when the bike was stationary and troubleshooting the issue I took a voltage tester to the positive terminal on the starter and the other end of the tester to a ground (i.e., the frame). The tester lit up indicating I had 12v power going to the starter. Note this was observed without pushing the starter button or touching anything on the bike. Why/how would I have 12v hot going to the starter when the system was NOT grounded off the battery?
I'm confused why I'd have what appears to be a 12v closed circuit to the starter when the ground off the battery was not attached? I just can't understand why this wouldn't result in an open circuit to the starter?!?!?!
Rick
P.S. FWIW, the broken welds on the subframe were my fault, not a material failure or poor welds.