Just went to start up my Dixon ZTR for the first time of the season.
The solenoid clicks, but nothing turns over.

The battery measures 11.3 VDC, and the headlights are bright.

Do I need to charge the battery, or is there something else wrong?

If I charge the battery, can I connect the charger directly to both
terminals of the battery, or do I need to connect the negative line to
the chassis somewhere, like I do with my car during the winter?