Rear Window Defogger: Testing: Grid
- Use a 12-volt meter and connect positive lead to right (Feed) side of vertical element on inside of glass. Connect negative lead to left side of vertical element. Turn switch "ON", voltage should be 10-14 volts.
- Connect negative lead to ground, disconnect positive lead and touch each grid at center of window.
- Voltage drop of 6-volts indicate good grid. Voltage drop of 12-volts at center indicates break in grid between positive lead and ground. No voltage at center indicates break in grid between center and feed wire.
- Exact location of break can be located by moving positive lead to left or right until abrupt change in voltage is noticed. Repair to grid can then be made.
Courtesy of CHRYSLER GROUP, LLC