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GAUGE OPERATION TROUBLE SHOOTING
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  19 Checking Fuel Level Gauge System with Gauge Tester
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 INSTRUMENTS Fig.  17 Fuel Gauge Circuit Diagram - the fuel level sender only when in its empty position. It  will  be  noted  that  variations  in  the  position  of  the  fuel level  sender  contact  will  vary  the  active  portion  of  resistance element  and  thus  control  the  amount  of  current  flowing  in  the bucking and full coils.  Maximum current in the bucking and full coils occurs with the tank unit in the full "F" position.  Under this condition,  the  magnetic  field  of  the  bucking  and  full  coils  is  at maximum  and  the  pointer  and  armature  assembly  will  align itself with the resultant magnetic field of the three coils the "Full" position.      As   the   fuel   is   used,   the   fuel   level   sender   contact position  changes  to  reduce  the  current  in  the  bucking  and  full coils and increases the current in the empty coil.  This variation in  current  reduces  the  magnetic  field  strength  of  the  bucking and full coils from a maximum at "full" to zero at the empty or "E" position at which time the armature and pointer assembly is aligned  with  the  magnetic  field  of  the  empty  coil.    Thus,  the interaction  of  the  magnetic  field  of  the  three  coils  produces  a resultant magnetic field which controls the rotation and position of the armature and pointer assembly. The sender and key switch terminals are connected by a calibrating  resistor  (Fig.    18).    The  odd  terminal  is  the  ground terminal. The  sender  terminal  is  the  first  terminal  clockwise  from ground terminal when viewed from back side of gauge. IMPORTANT The  gauge  is  grounded  to  chassis  through  the ground  terminal  when  plugged  into  instrument cluster printed circuit. When   the   key   switch   is   turned   off,   pointer   will   not necessarily return to the empty position.  This is inherent in the instrument and does not indicate a faulty part. Fig.  18 Fuel Gauge (Rear View) CTS-2735R  Page 10 PRINTED IN UNITED STATES OF AMERICA

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