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Control Switch Test

  1. Check test light by connecting it to battery terminals and note light intensity. Before starting engine, detach ignition harness electrical connector from heater control switch.
  2. Connect test light to load (choke) terminal of control switch and ground. Start engine and allow it to reach normal operating temperature.
  3. Apply 12 volts to ignition harness terminal of control switch. If test light does not light or have original intensity, replace defective control switch.
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