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Home >> Ford >> 2000 >> Mustang Base, 2D Convertible, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Heated Glass/Defoggers >> Rear Window Defogger System >> Component Tests >> Grid Filament Test

Grid Filament Test

  1. Shine a strong light through grid from inside vehicle. Inspect grid from outside. Broken grid lines will appear as brown spots. Run engine at idle. Turn defogger on. Indicator light should illuminate.
  2. Connect negative lead of a voltmeter to ground. Touch positive lead to wide Red/Brown strips on rear window. Meter should indicate 10-13 volts. If voltage is lower, ground connector C434 (Black wire) at rear window defogger grid connection is loose.
  3. With voltmeter negative lead grounded, touch voltmeter probe to each grid line at its midpoint. A reading of about 6 volts indicates grid line is good. If voltmeter reads 12 volts or zero volts, grid line has a break. See GRID FILAMENT REPAIR  under ON-VEHICLE SERVICE.
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