The clicking sound is a relay in the pack that is regulating the voltage. The rate at which it is clicking indicates that the capacitors are on the way out. You can keep using it like that but your relay may burn out. I would contact Devon Reno at Photo Electronics in Chicago. He's quitting the business soon but he knows how to fix these Balcar-made packs. You can find him at www peekyou com/devon_reno/173771430. Tip: the username on that page is his aol email username. He can also tell you a story about those rectangular plugs and a foot-long spark. :)
