You have a hot wire touching a ground somewhere. EVERY connection needs double checking. Feel around for a wire getting hot when key is on and when hitting starter button. Disconnect signals, lights, horn, signal relay, gauge lights (oil pressure light and lead as well) and see what happens. Also battery hot lead ans starter solenoid needs checking for touching something.
Recently a buddy's Suzuki Intruder wouldn't start or crank. I asked him what he did so far; he replaced the battery and the starter solenoid. After much digging around and head-scratching (I'd stop-by and poke around several times over the course of it sitting unusable in his garage for 3 months. It would not crank and a new starter was the next option), I noticed the nut from the starter solenoid was touching the frame. I simply re-angled it, pressed the starter button and it started right-up. The symptoms included wires to starter getting hot, and wierd clicking/humming sounds instead of starter cranking.
I owned a 700 Maxim for a while; nice-sounding machine.