B4000 SE Regular Cab 4WD V6-40L OHV (1999) Engine Lubrication | Oil Pressure Sender | Locations
Oil Pressure Sender: Testing and Inspection
Oil Pressure Gauge/Oil Pressure Switch Test
With Fuel Thermometer SST 49 0839 285 attached to the oil pressure switch connector and the ignition lock cylinder in the ON position (engine not
running), set SST to infinite resistance. The center line of the pointer should fall on or below the "L" mark.
Short the connector directly to engine ground. The centerline of the pointer should fall slightly above mid-scale.
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If the oil pressure gauge tests within calibration, replace the oil pressure switch.
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If the oil pressure gauge still tests out of calibration, replace the gauge.
