My Juice/wine fermented for three days then stopped. I used champagne yeast since I wanted a dryer wine. I also only added 1/2 amount of sugar called for. Was that my problem, not enough food for the yeast?
It might be finished with the visible part of the fermentation. Give it a full week; 2 weeks at the longest, then rack it to another carboy to get it off the sediment (and don't forget to taste a sample)