It's common for sockets in outdoor fixtures to stop working after years of service. The Phoenix heat and blowing dust can deteriorate the metal contact points to the degree that new bulbs no longer light up.
If you replaced the bulb in your outdoor light fixture and it still doesn't work, this could be the cause.
In most cases, I can replace the socket with a new one to extend the life of your coach light, outdoor chandelier, or landscape light.
This service can be combined with surface refinishing, resulting in a fixture that's essentially brand-new, and for around half the cost of a new fixture.