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Fuel Level Warning Light Switch Test

  1. Remove fuel gauge sending unit. Apply battery voltage across the following terminals of fuel gauge sending unit connector (sending unit side of connector).
  2. Connect a 3.4-watt test light between battery positive terminal and sending unit connector. Test light should come on after a few moments. Submerge entire sending unit (or fuel level sensor portion) in a container of fuel. Test light should go out. If operation is not as specified, replace sending unit.
Fig 1: Testing Fuel Level Warning Switch
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