Something drained my battery . I notice that when I disconnect my recharged battery at the terminal that a small spark appears . Am I correct in thinking that when I put a test light between the battery terminal and the battery terminal clamp , that the test light will light , and that when I disconnect the offending connection , when I find it , the test light will go out ? I will first try disconnecting my ignition switch (2 wires) as it feels a bit sluggish .