I have a 2012 Ford Focus (sedan version). The third brake light stopped working recently and I'm trying to determine if the problem is with the light itself or inside the vehicle, but a I have very limited toolset.
Is there anything I'd have laying around the house that I can use to either confirm that the light works by itself (it says 13.5v and has two pins that the wires connect to) or something else I could (safely) wire to the car instead of the light, that would identify where the problem is?