It sound like you have a broken neutral wire. With the switch on and
the light bulb in place, check the neutral wire (white) with your
sensor. If it beeps, then you have a broken neutral wire somewhere
downstream. If it does not beep, then the problem is with the light
fixture itself, which should be easy to fix.

Most problems occur at the fixtures, and rarely on the wires behind
the walls. I would check the neutral wires on both lights to make sure
none of them have come loose.







On Jul 16, 5:55 pm, Alan wrote:
Hi,

Here is my situation.

Have a light switch that controls 2 lights -- A & B on opposite sides
of the front of my house. The wire runs from switch to light A and
then a wire runs from A to B. Both lights used to work. I recently
had construction in my house and had new wood siding put up outside
and drywall inside. Now light A works but B does not.

Here is the weird thing. When I put my electrical sensor (I don't
have a volt meter, just the device that beeps if current is present)
to the wires of light B, it beeps as if current is present when the
switch is on. However, the fixture does not work. I have tried new
fixture and new bulb including moving the fixutre from A that I know
works there.

I am guessing that during remodeling they somehow hit the wire with a
nail or screw. But why do I show some current there at all? And if
they hit it with a screw/nail, shouldn't I get a short and keep
blowing a breaker when I turn on the lights?

Can anyone shed some light (sorry for the pun) on this for me? I am
hoping there is a good answer as trying to run a new wire will be
difficult and expensive for me.

Thanks.

Alan