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System Test

  1. Remove switch from instrument panel with wiring still connected. Turn ignition "ON". Check for voltage at terminals B and I. Both should have 10 to 14 volts present. Terminal L should indicate 0 volts. If L shows voltage, check to be sure switch is "OFF". If it is, replace switch.
  2. Move switch to "ON" position. Voltage should be present at terminal "L" for about 10 minutes and indicator light should be on. If light is off, check bulb. If no voltage present at terminal "L", replace switch.
  3. If system still does not operate, check leads and grid lines at rear window. Turn ignition and control switches on; attach a voltmeter between points "A" and "B" (See Figure). Voltage reading should be 10-14 volts, if lower, check ground connections. With voltmeter connected at "B", measure grid voltages at midpoint "C". Voltage should be approximately six volts, a reading of zero volts indicates a break between point "A" and midpoint "C". A reading of 12-13 volts indicates a break between midpoint "C" and "B".
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