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Old 09-08-2019, 07:06 PM   #1
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Default motion sensor w/ light

my motion sensor outside my door quit and replacing it is causing an issue. The new unit bench tests good and there is power (125vac) where it is to be installed but it doesn't work? The house has some knob and tube wiring in the attic where this wiring comes from. help!
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Old 09-08-2019, 07:28 PM   #2
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You need proper polarity
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Old 09-08-2019, 07:56 PM   #3
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my motion sensor outside my door quit and replacing it is causing an issue. The new unit bench tests good and there is power (125vac) where it is to be installed but it doesn't work? The house has some knob and tube wiring in the attic where this wiring comes from. help!
It's definitely a good idea for you to be playing around with this wiring. I can't see what can possibly go wrong.
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Old 09-08-2019, 07:56 PM   #4
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You need proper polarity
Like + and - ?

How do you know which is positive and which is negative? I could never figure that out.
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Old 09-08-2019, 08:01 PM   #5
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How do you know which is positive and which is negative? I could never figure that out.
It's not hard. Just press the bare ends to the metal box.
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Old 09-08-2019, 11:05 PM   #6
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This appears to be a case of S.H.I.T. (Selective-harmonic-interference-transferal). This phenomenon can occur when when a generator is connected in a manner to back-feed singe-family dwelling-units via a dryer receptacle or (in limited cases) if certain wire connectors lack adequate isolation.

Research has proven the possibility that the amount of harmonic-interference produced by standard pigtail connections is sufficient to hinder the correct functionality of an electronic apperatus. A straightforward remedy might be several layers of rubber splicing-tape over any pigtails within a 20-foot radius of the device.
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Old 09-09-2019, 05:07 AM   #7
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Shoulda bought the wireless unit.
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Old 09-09-2019, 06:55 AM   #8
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