![How can you determine if a mystery switch controls a light fixture or a receptacle, just by looking at its junction box? : r/HomeImprovement How can you determine if a mystery switch controls a light fixture or a receptacle, just by looking at its junction box? : r/HomeImprovement](https://external-preview.redd.it/voQhsrc4mTVgu-GyNpM9sOzvPOQM4ubr1vSJYJnumv0.jpg?auto=webp&s=e75731bda1ac15ee452dd1dc2a29cfe0a4dae0f8)
How can you determine if a mystery switch controls a light fixture or a receptacle, just by looking at its junction box? : r/HomeImprovement
Why isn't this replacement switch turning my living room light on? The old switch (1940s) was arcing, so I replaced it. (Pics in comments) - Quora
![electrical - Light switch not working; both outlets are always hot - Home Improvement Stack Exchange electrical - Light switch not working; both outlets are always hot - Home Improvement Stack Exchange](https://i.stack.imgur.com/DEsU2.jpg)