A test light "may" work but I have no experience using one to check for current draws because I bought a meter years ago to know more of what I am dealing with. We could assume that with a bright illumination of a test light bulb we have a bigger draw than if it was not as bright but it doesn't give us a number. Someone may have figured out a way to get an idea when a particular bulb such as an 1156 or 1157 bulb is used that a decent brightness the draw is 5A (and this is just a random number I'm throwing out) but at a barely seen illumination with no other ambient light in the room this now means you have 0.01A draw.Would a test light work as well? Does it matter which post? Could the alternator have anything to do with it? The battery has been disconnected on a battery maintainer most of its life due to the discharging issue . . . time to fix it!!