We have a sensor light that blew both bulbs and I have finally got around to changing them.

The sensor is separate to the lights, and positioned about half a foot below the lights.

I replaced the bulbs but when I turned the switch on I got nothing.  I have one of those basic power checkers pen gizmos and waved it around the sensor and the lights.  I have power to the sensor, but I am getting no readings when waving it around the lights.

I'm trying to figure out if the lights are broken, or if the sensor feed to the lights is broken.

If the lights are broken would I still expect to get a reading from the power checker pen?  i.e. if the light is broken but the sensor is sending it power would I get a reading?   If there were no bulbs in the lamps would I expect a reading?

I ask that last question because I really struggled to get the replacement bulbs in, they are G9 halogens and the wire loops at the bottom were slightly bigger than the ones I took out.  I'm hoping its not some slight variant bulb and I have the wrong ones.  After much pushing and cursing they seemed to click into place, but there is a possibility they are not seated correctly.

I can undo the lights from the wall to access the wires if you think that needs to be done to get a proper reading rather than waving the pen around the light fixture.

Yes I can just buy a new all in one sensor light combo, but as my current sensor and light are positioned so far apart i'd have to patch a hole where the old lights were which i'd really rather not do if I can avoid it.