OT electricians - simple light switch question

It sounds like you have a simple hot and a switch leg. Sounds like it's done right. You may have a bad sensor.

did u turn the power off before hooking it up ..... very easy to burn up an electronic motion sensor ...

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before the 2 black wires were plugged into light witch and 2 whites are wired together with a cap.

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This is the way it's done the neutral, (which flows to ground) is always continuous. The hot leg (black) is turned on and off by the switch. The ground is just a direct to ground. (meaning it's use either way won't affect anything unless it's a ground-fault interrupter switch)

Now with a sensor light IT DOES MATTER where the always hot leg of the wire is attached and there the switched output goes (in a normal switch it doesn't matter)

So simply put you have two possible outcomes. Either the switch sensor is bad OR the black wires are backwards going into the switch.

You should have bought your light switch from Amazon

Thank you!! Ill try another switch.

Follow the instructions on the new switch.

Before, all the switch did was break contact on the hot lead (switch leg).

I suspect the new switch needs a neutral to power the sensor circuitry.

You can get the neutral by adding a small white wire to the neutrals all wire nutted together.