You didn't say what you're working on. If I'm understanding your test light connection correctly, it sounds like you have something that's always switched on. A short to ground would either blow a fuse or burn a wire in two.
Do you have an alternator installed? If a diode went bad on it, that would drain the battery.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.