S-SERIES INSTRUMENTSGAUGESExcept for air pressure, air restriction, and other optionalgauges which are mechanical Bourdon tube ordiaphragm-type all gauges are of the electromagnetic aircore-type. In each system to be monitored (Fuel Level,Oil Pressure, Water Temperature, etc.), a sender uses avariable resistance to control current from the batterythrough a coil or coils in the gauge.GAUGE TESTERTo assist in checking the electrical indicating-typegauges, use of a universal-type Gauge Tester SE-2781(Figure 16) is suggested. This test eliminates time-consuming trial and error methods of checking out thegauges.Figure 16 Gauge Tester (SE-2781)To test gauge operation, the sender wire is disconnectedfrom the sender unit and the tester is connected betweenthe sender wire and ground. The tester substitutes forthe sender unit as shown in Figure 17.Figure 17 Gauge Tester ConnectionsProcedures for testing temperature, fuel level, and oilpressure gauges with the gauge tester are given later inthis section. Tester setting and gauge readingspecifications are shown in Table 1.NOTE - To ensure full power to all Instruments Incluster, connector lock tabs on both sides ofharness connector must be solidly engaged withcluster socket.TABLE 1GAUGE TESTER RESISTANCE SETTINGS (Ohms)(For Use With SE-2781 Gauge Tester)Gauge ReadingType of GaugeLow ScaleHalf ScaleFull ScaleWater Temperature:With 260° Gauge136511355With 220 Gauge136521299Fuel Level14488Oil Pressure14788Oil Temperature:Engine13656328Transmission13656328Rear Axle13656328CTS-4140Y Page 8
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