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Filament Testing

  1. To locate breaks in grid wire filaments, attach a voltmeter to middle portion of each filament. Attach other meter probe to vertical section of window grid.
  2. If a grid is broken, meter will read zero volts or battery voltage, depending if grid is broken between or outside test leads. If wire is not broken, meter will register about one-half of battery voltage. To locate break, move probe along wire until meter needle moves abruptly.
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