Read LED state without any relay or button

This is a very silly question. I am a newbie in Electronics and Arduino. I want to know if i can get the current status of LED which is connected with a 9V battery. I tried to read using digitalRead but it is always returning 1 no matter what.

All i want to know is, If i turn ON some equipment using arduino and relay, Is there any way to check that the equipment is really ON?

I'm using NodeMCU v3 Wifi.

One important thing is that you must never connect a voltage greater than he processor’s rails to any input. So connecting a LED that has one end connected to 12V is going to damage your Arduino.

You need to post a schematic of how you are wiring this up before we can tell you if you are doing it wrong.