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Yes it sounds like the alternator, make sure the belt did not come off or is loose as well, check the cables from the alternator to the battery and make sure they are not corroded or resting on the frame or you can have voltage loss.
As far as the battery and alternator, most any auto parts store can bench test the alternator and load test the battery to see if they are bad. Places like Auto Zone and Napa etc should have that ability. The challenge is it is Easter weekend and not sure who is going to be open but that is what I would try have an auto parts store test the alternator and battery and go from there....
Hope this helps some.... Robert
Not so sure on that as 9 volts everything will start to shut down on you, the best chance is to change the battery or have it charged maybe carry a spare one as well, the headlights are going to draw some major amps and suck that down fast if the alternator is not charging....
Hi again, was just checking in to see if you needed more help on this?