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Fig.  17 Fuel Gauge Circuit Diagram
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  20 Water Temperature Gauge Circuit Diagram
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 INSTRUMENTS Fig.  19 Checking Fuel Level Gauge System with Gauge Tester Test for faulty component as follows. 1. Disconnect wire at tank sender unit (Fig.  19). 2. Connect one lead of SE-2781 Gauge Tester to end of sender   unit   wire   and   second   lead   to   ground   (tester substitutes for sender unit). 3. Turn key switch "on". 4. Set gauge tester for 88 ohms (left hand control knob to "50" and right hand knob at "38").  Fuel gauge should read slightly above "full".  (Pointer within ball). 5. Next  set  left  hand  knob  at  "0"  and  right  hand  knob  at "44".  Fuel gauge should read at "1/2" mark.  (Pointer within ball). 6. Finally set left hand knob at "0" and right hand knob at "1".  Gauge should now read "empty".  (Pointer within ball). If  fuel  gauge  reads  properly,  gauge  and  wiring  between gauge and sender is OK and trouble is in sender grounding or sender itself.  Replace float assembly if proper grounding does not correct the problem. If fuel gauge does not read properly, check continuity of circuit with standard test light (Fig.  12).  If continuity is OK and gauge still does not respond, replace gauge. WATER TEMPERATURE GAUGE The   water   temperature   gauge   system   consists   of   two basic    components--the    instrument    cluster    gauge    and    the thermister sending unit.  The gauge indicates water temperature while the sender controls the gauge reading.  The two units are connected electrically as shown in Fig.  20. The   operating   principle   of   the   temperature   indicating system can be understood by reference to the temperature gage circuit   diagram   (Fig.      20).      With   the   ignition   switch   closed, current will flow from the battery through the bucking and "cold" coils and the fixed resistor to ground, and through the "Hot" coil and the variable resistance temperature sender to ground. The     temperature     sender     consists     of     a     thermistor enclosed  in  a  sealed  threaded  shell  containing  a  heat  transfer medium  and  equipped  with  an  insulated  terminal.    With  the temperature   sender   immersed   in   a   cold   liquid   (1000F),   its resistance is high and the current flowing through the "hot" coil is small; therefore, the magnetic field produced by the "hot" coil is  negligible.    At  this  time  the  pointer  and  armature  assembly will align itself with the resultant magnetic field produced by the "cold" and bucking coils at the 1000 F position.  The magnetic field  of  the  "cold"  and  bucking  coils  is  always  a  constant  and serves   as   a   reference.      As   the   temperature   of   the   liquid increases,   the   resistance   of   the   sender   decreases   since   the thermistor has a negative temperature CTS-2735R  Page 11 PRINTED IN UNITED STATES OF AMERICA

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