Ariens Zoom XL 54 Riding Mower - No crank
I have an Ariens Zoom XL 54 (model: 915149). I tried starting it up today and I could hear a click from the solenoid but it does not crank. It does not seem to be related to any of the safety features because the solenoid does not click if I engage PTO, disable parking break or get off the seat.
My multimeter is showing 12.6V at the battery and at the line-in post on the solenoid. When I turn the ignition to START, the line-out post that runs to the starter does not show any voltage. But, if I disconnect that line (between solenoid and starter), I do get 12.6V on that post.
When I jumped between the two posts on the solenoid, the starter made a weird spinning sound. It definitely was not the normal cranking sound I'm used to hearing. It did the same thing when I jumped directly from the battery to the starter. For reference, I found a video of someone else with a similar issue on their bike: https://docs.google.com/file/d/0B7-BdrVIl7V9dlUtZFpxZTc2cjg/edit.
Is there anything I could look at to further diagnose a starter issue? The engine is a Kawasaki FR691V.