Light comes on with the headlights. Should be a red-ring around the 12v socket, and a clear panel at the back that shines the same light into that area.
If you put the headlights on and still don't see anything, see if you have any current to the 12v socket. Could be a fuse?
Edit: You're only going to see this in a semi-dark environment. I saw it in my garage, but not in the street on a very overcast day.
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