Electrical question. Wiring help

Did the switch come with directions? It may give you some indication of where you went wrong.

I know sometimes the switches can be wired in a 3-way configuration so you may just have a wire misplaced. But the directions that came with the switch should tell you where the wires terminate.

Black from switch goes to red on light. Leave the switch on all the time.

Black on the switch is used to turn the light on/off without the motion detection. This is why the motion detection does not work the way you have it wired.

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Black wire from the new switch should connect to the black hot wire in the box, white to neutral, green to ground, the wire with the red strip goes to the light itself

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This. ^

Neutral to Neutral
Ground to Ground(s)
Now you probably have two black conductors in the gang box. One from the light and one that is source power from the breaker panel. You will need to differentiate between those two.
The black wire that is source power from the breaker panel should tie to the switch's black.
The Red "load" wire should be tied to the light's hot conductor which is probably also a black wire.

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I wired gr to gr. Neutral to neutral. Hot, load, hot together. It works on and off. But will not activate with motion.

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Correct, it will only work on or off since you tied the load conductor in with the hots.
Essentially you're bypassing the auto on motion function and have it wired like a standard light switch.


..............at least this is my understanding unless I'm missing something here.