I recently bought a house built in 1972. It had 4 double spotlight (standard switch controlled) at each corner of the house with the romex coming down thru a hole in the wood soffits.
Two of the fixtures didn't work and the bulbs were good.
Using a voltage tester i removed the fixtures and determined neither fixture had power at the wires.
Could the power be piggy backed off one of the working fixtures and has become detached?