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Tailgate Window Defogger: Testing: Grid

  1. Use a 12-volt voltmeter, and connect positive lead to right (Feed) side of vertical element on inside of glass. Connect negative lead to left side of vertical element. Voltage should read 11 to 13 volts with ignition "ON".
  2. Connect negative lead to ground, disconnect positive lead and touch each grid at center of window.
  3. Voltage drop of 6 volts indicates good grid. Voltage drop of 12 volts at center indicates a break in grid between positive lead and ground. No voltage drop at center indicates break in grid between center and feed wire.
  4. Exact location of break can be located by moving positive lead to left or right until an abrupt change in voltage is noticed. Repair to grid can then be made.
    Fig 1: Voltmeter Connections and Voltage Drop for Grid Continuity Abrupt voltage change indicates location of break.
    G09337476Courtesy of CHRYSLER GROUP, LLC
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