What would cause a single track lighting fixture to flicker?
A flickering light could be caused by one of several issues in
the electrical system. Assuming the track is 100% okay, it could be
the way the fixture is mounted. It must make solid contact with the
electrical rails in the track. The contacts must be good. Are they
clean and solid? Is the wiring in the fixture okay? All the way
from the track pickups to the socket? Is the wiring at the socket
solidly connected to the socket itself? Is the socket clean and in
good shape? How about the lamp contacts? Are they clean and in good
shape? Bayonet-mounted lamps with two "pins" that push into
spring-loaded socket contacts can become oxidized and become
intermittant. Sockets are the most vulnerable point in the circuit
outside the lamp filament, which can just "burn out" as we all
know. And when in doubt, replace the lamp and see what's up. If
you've done that and it still flickers, the socket (first place)
and the track contacts (second place) are the next places to look
for trouble.