Charging system testing- weak starter? just clicking? Is it the battery?

[Thumper]

Originally Posted by Do©Hawk

I pulled the body panels, seat, tank and headlight so I could scour over the wiring harness and connections. All seems well.

I pulled the starter. The spline end does not appear damaged. When I run jumper cables from the battery to the starter directly, I only get sparks at the post on the starter. No motion from the starter at all. Still measuring 13v from the battery.

Ooo. Sounds like a bad starter(grounding out somehow, or worn out brushes). Starters can be refreshed if there is a recognizable grounding, but simplest thing is to replace the starter motor. It might be possible to replace the brushes if you can fine them.