Don't know, customer brought it in to size up a comparable wet-cell. I was on the way to the core pile, tripped on a d%%n Sportster muffler. The salvage yard section is protected by "guard bunnies", who apparently think it is great fun to push junk around the yard at night. Yes, I said bunnies...as in 5 wild rabbits.
-WD

The simpliest test- 1. squeeze the clutch and tie it there. put Your hand on the st. solenoid. try to start the bike. If You feel the click in the st. solenoid and nothing elce happens check for power at the st. solenoid  therminal that is connected to the st. motor. If there is a power- proceed to check at the st. motor. If there is not a power- bad st. solenoid. If there is a power- st. motor.
                 Test 2. Try to jump between the 2 terminals of the st. solenoid. If the bike cranks over - check for a power at the st. solenoid  Y/B wire when pressing the starter button. If there is a power - check for grownd at the B/W wire of the same connector. If there is grownd - blame it to the st. solenoid.

I think Slavy is pretty close here.  That B/W wire is sort of a switched ground in the system with all the interlocks.  Try to jump the solenoid terminals (the 10 MM nuts) and check to see if you have 12 Volts on the 2 smaller Y/B and B/W wires when you hear that click.

However, I'd almost bet a case of beer that you don't have a bad starter solenoid.  Too much coincidence after just draining the battery in the park position.  I think something else happened during the initial "what the hell is wrong" testing

Also, you mentioned that you jumped it, it idled, and then died when you tried to drive it.  Did it idle normally or did it idle rough?

Do you also have a nuetral light on the speedo when you try to start it?

Do all the lights and horn work?