Using a voltmeter probe to detect a broken rear window defroster wire
Using a Voltmeter to Locate a Broken Rear Defroster Wire
Using a voltmeter to locate a break in the rear window defroster conductor
The rear window heater is a set of horizontal conductors deposited on the inner surface of the rear window.
To detect a break in the rear defroster wire, turn on the ignition and the rear defroster switch.
Connect one probe of the voltmeter to the mass of the car, and wrap the second probe with foil and move the foil along the heater conductor, see fig. Using a voltmeter probe to detect a break in the rear defroster wire.
Connect a voltmeter lead to the center of each rear defroster wire. If the voltmeter shows a voltage of about 5 V, then the heater conductor is good. If the voltmeter shows a voltage of 0 V or 12 V, then there is a break in the heater conductor, see fig. Use of a voltmeter to detect a broken conductor of the rear window defroster.
To locate a break in the heater conductor, connect one voltmeter probe to the positive terminal of the heater, and move the second probe along the heater conductor from the negative terminal of the heater. The point at which the voltage indicated by the voltmeter drops from a few volts to zero is the break in the heater conductor, see fig. Using a voltmeter to locate a break in the rear window defroster conductor.
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