Rear Window Defogger Filament Check
1. Attach probe circuit tester (in volt range) to middle portion of each filament.
- When measuring voltage, wrap tin foil around the top of the negative probe. Then press the foil against the wire with your finger.
2. If a filament is burned out, circuit tester registers 0 or 12 volts.
3. To locate burned out point, move probe along filament. Tester needle will swing abruptly when probe passes the point.