I always expect the unexpected. However, not much advice can be given unless we know details about the device, setup, and power source. The only thing I know is that the BG-12 works intermittently, which may suggest an issue with wiring, but that may not be the case. It may just look like RED to RED and BLACK to BLACK, but it is never that simple.
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I find it highly unlikely that our OP has somehow gotten their hands on one without knowing it.
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