Chandelier type light in foyer

bj4e

Foyer chandelier on a 10 foot chain wont work. Power to switches and ceiling box but chandelier wont work. Before I take it all apart, I was wondering what the little black plastic box is that the wires go thru half way up the chain? Is this some kind of fuse?

dmxtothemax

It is probably a j box !
Most lights dont have ten foot leads on them,
So the wire was extended, and the join is in the j box.
Check for loose wires in j box !