Yes, drawing a spark at the cable is an indication of a battery drain.
Like Bruce said, start with the alternator, disconnect all the wires, see if the spark stops.
Another test is to disconnect one battery cable, connect an incandescent test light in series between the battery post and the cable. If the light glows bright, there is a drain. A very dim glow might be seen if there is any electronic equipment in use. This is normal and would take months to drain the battery.
Then you can start pulling fuses, disconnecting wires until the light goes out. Common causes are, as said, the alternator, an accessory that's been left on, corroded wire connections, especially where the connection gets wet or are near the battery, an improperly connected accessory, anywhere the wiring has been damaged, burned, pinched, mouse chewed, or modified.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don�t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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