Filament Check

When measuring voltage, wrap tin foil around the top of the negative probe. Then press the foil against the wire with your finger.

Fig 1: Pressing Foil Against Wire
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Attach probe circuit tester (in Volt range) to middle portion of each filament.

Fig 2: Attaching Probe Circuit Tester To Middle Portion Of Filament
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If a filament is burned out, circuit tester registers 0 or battery voltage.

Fig 3: Checking Voltage Between Wires
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To locate burned out point, move probe to left and right along filament. Test needle will swing abruptly when probe passes the point.