Give Cross to Priest in church (I'm assumng you went in the building on the same level with the fountain already). I believe you'll get something in return...it's been so long, but I think it's something that will help you open the box outside, (it's next to Dr.s office that has musicbox)...but if you say you think you have to shortcircuit something then , you must have already opened box and put the connection for the water to flow into the fountain....so really if ther is water in the fountain, then all you need to do is give the cross to the priest inside the bulding(get ready for lots of questions like level one).
Let me know if you opened panel and got water into fountain, cause when I did it I had to give cross to priest in church first...Let me know if I've helped?????????Thanks..
Hanksdog