Alright, so I built a can light awhile ago. It ended up flooding. I'm trying to revive it now, however I can't get it to turn on after overhauling the insides. I think the issue might be with the battery pack. It's 4 cells and I get a reading of about 16.2V from end to end. I have a protection circuit on it that I thought was causing the issue, but replacing it didn't help. I'm not sure why, but I can't get a reading from the output of the protection circuit. Any thoughts?