stern light

So I installed a new light base for the stern and for some reason my new light is not working. I also don't know how to figure out if there's any power going back there which I don't think there is but I don't know where to trace this wire. It's gray and white. Hopefully I got it on this picture...

Our anchor/stern light pole broke over the winter and I'm trying to replace it. Unfortunately I have not been able to find one that is the same size. Our original pole is 84 inches long but none of my searches online comes up with anything close to that length. Does anyone have a resource for...

I replaced my transom mounted stern light fixture with an LED unit purchased from West Marine. However my mast light is staying lit in the fore and aft position (illuminating 360). Regardless of the position of the light switch, the mast light stays fully lit (as if I am anchored). Could this be...