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Wiring Harness Operational Test

  1. Unplug connector at coolant temperature sender. Turn ignition switch to ON position. Temperature gauge should indicate COOL. Turn ignition switch to OFF position. Connect a 12-volt, 3.4-watt test light between coolant temperature sender harness connector terminal and ground.
  2. Turn ignition switch to ON position. Test light should glow and temperature gauge should slowly move to HOT. If gauge functions as described, replace sending unit. If gauge does not function as described, perform TEMPERATURE GAUGE RESISTANCE TEST below.
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