I am replacing an old light fixture. The junction box has no ground wire coming out of it. The instructions say that if this is the case to attach the ground wire from the light fixture to the green screw on the mounting plate.
Here is a picture of the old light where they have apparently done exactly that:
So how does this work? The ground has to lead back to the breaker box in order to work right? Is this mounting bracket connected to a wire leading to the breaker box?
Here is a pic of the inside of the box:
It does actually appear that the box has an attached ground wire leading out of it, so that's good news.