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.
- Attach probe circuit tester (in Volt range) to middle portion of each filament.
- If a filament is burned out, circuit tester registers 0 or battery voltage.
- To locate burned out point, move probe to left and right along filament. Test needle will swing abruptly when probe passes the point.