I'm trying to replace a regular light switch with a motion activated switch that automatically turns off after xx min. I'm of course trying to save some $$$ by DIY
I'm by no means a handyman, but I figured I could be able to replace like item with like item.
Upon opening the switch, I see a two black wires and a loose green wire. I understand the green is the ground, and I can connect that to the new switch. However, on the new switch it wants 1 black and 1 blue wire. I understand one is "hot" and the other is "load" but I can't tell which is which.
Is it bad/dangerous if I take my 50/50 chance and try it out, and if it doesn't work change it? Or do I really need to invest in a circuit tester to find out which is "hot"?