desgnr wrote:
I have 3 lights on 1 switch.
It operates a light at the front door & a light on the garage & a light
on a pole at the end of my walkway.

The light on the pole won't light, YES the bulb is good.

How can i find out what is wrong since all 3 lights are on the same
switch in the house next to my front door.

Got a voltage tester???? If not, need one; the neon bulb two-prongie
things will work for this.

Start by checking to find out if there's voltage at the socket; if so,
as another says, may be as simple as the tab at the bottom. If not, to
to the base of the socket where the wires connect to it and test between
the wires -- if no joy, go back to wherever that feed comes from to the
outside and disconnect and try again. You'll either find a loose
connection at one of those points or discover there's a break between
point A and point B at some pair of points in the chain.

--