For further clarity 1. It is a quality PIR security light. You do not need to override it by confusing circuit, as somebody stated, by switching on and off and on again. That 'statement' was related to 'cheap' PIR's in general, and not to your top quality, PIR specifically. 2. Nice theory that somebody has put a nail through squeaky floorboard and taken out a wire, but this is all new wiring arriving in a new dry lined wall, integrity of wiring is ok. And that 'theory' was never intended to be relevant to your topic: It's merely a recurring piece of sarcasm aimed at a certain individual..... 3. Despite certain individuals trying to tell me otherwise (no names to protect the guilty!!), it has > to be the switch. It doesn't have to be the switch, it could just as well be a poor connection (from the switch) at the PIR terminals. Without the benefit of further clarity, the suggestion by that certain individual, was wholly reasonable. Have you sorted out that blessed plastic lug yet? Marj.