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Control Switch Test

  1. Check test light, before starting test, by connecting between battery terminals. Note light intensity.
  2. Before starting engine, detach ignition harness electrical connector from heater control switch.
  3. Connect test light to load (choke) terminal of control switch and to ground.
  4. Start engine and allow to reach normal operating temperature.
  5. Apply 12 volts to ignition harness terminal of control switch. If test light does not light or have same intensity as when first tested, control switch is defective and must be replaced.
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