First, check the obvious, bad lamp, bad fixture, bad ballast, bad switch.
The most common causes of a dead circuit are:
Defective breaker, especially ground fault breakers. Check for power at the breaker, where the wire connects.
A tripped GFI receptacle. The receptacle can feed other circuits down stream.
A bad connection behind a receptacle. Many contractors use the push in spring clip type receptacles. They are prone to get loose, burn the spring and loose connection, especially where there is a heavy load, like a washing machine, heater, etc. If aluminum wire was used, this is a very common problem. If you know which breaker controls the light, turn off the breaker, check all the outlets in the area to see if any are on that circuit. Then start pulling the receptacles out, inspecting the wires. CAUTION!!! Some outlets share a neutral! If the neutral has failed, or when the neutral circuit is removed from the receptacle, power can back feed from another circuit, making the neutral hot!
Trying to determine what is on a circuit is somewhat difficult. Typically the lighting circuit is separate from the outlets, but not always. The general rule, try to imagine the route that would use the least amount of wire. It is rare for a wire to be spliced inside a wall, but it happens. I usually assume that as a last resort. Check, double check before tearing into something unnecessarily.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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