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Old 10-01-2013
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Re: WTF is this?

OK the large component is a piezo buzzer - I think it is - (PKB6-5A0)

Is there a connection from the other side of the rheostat? I can't see one. There is also a small Motorolla component which I can't identify.

Anyway FWIW - holding tank alarm seems very likely based on your observations of where the wire goes. The button is probably a temporary reset of the alarm.

Take a close look at the red wire from the rheostat. It appears very close to shorting out against the fuse terminal...
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