That's the one. It controls your AC switching (for a lack of better terminology). Without that plugged in, it will be stuck on DC positive. That was the loose plug on wrench tamer's unit as well. Not sure why we have seen it loose on two units like this close together. I know I haven't seen any, maybe Mike has, or Ray. Move the copper strip coming out the bottom over so it doesn't touch the wire of the transformer (black thing, red wire pic 4)
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