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Control Switch/Timer Relay Test

  1. Remove switch from instrument panel with wiring still connected. Turn ignition on. Using a DC voltmeter, check for voltage at terminals "B", "I" and "L". See Figure . Both "B" and "I" should have 10 to 14 volts present. Terminal "L" should indicate 0 volts.
  2. If terminals "B" and "I" show no voltage, check circuit for defective wiring, blown fusible link, open circuit breaker, or bad bulkhead connector. If "L" shows voltage, place switch in "OFF" position and allow switch to return to normal position. If voltage at "L" is still present or indicator lamp remains on, replace control switch/timer relay.
  3. Place switch in "ON" position. Voltage should be present at terminal "L" for about 10 minutes and indicator light should be on. If light is off or no voltage is present at terminal "L", replace control switch/timer relay.
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