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Could use a little more clarity of purpose...
I was expecting to be a very straightforward solution for my problem, but looks may be deceiving, Oh well... I will assume for now it's mission impossible.
Well... good for you... but that doesn't answer my question.That's exactly what I did in 1982. Just wired a buzzer between headlight +12 and ground of the drivers door switch through a diode OR. One diode was factory.