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TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued (3) If no alarm, check wire for continuity.  Wire number for pump panel is 115 and for cab is 47. Both wires run in same harness as gage circuits in a preceding (see step 3). (4) If wire is good, replace alarm lamp and retest as in 2 preceding. (5) To test sender, remove from engine and with continuity tester connected between terminal and body, immerse sender in boiling water.  Sender contacts should close at 210 deg. F (98.9 deg. C). c Engine Oil Pressure Gage Test (1) Run main engine and monitor oil pressure gages on pump panel and in cab.  Each gage is supplied from a different sender. (2) If pressure is not recorded on any one gage, ground the S terminal on gage.  If gage does not register, replace gage. (3) If gage registers, either sender or wire is at fault Check wire for continuity.  Wire number for pump panel is 112 and for cab is 41.   Both wires run in same harness as gage circuits in a preceding, see step 3. (4) If wire is continuous, replace sender (see Illustration for sender location). d Engine Oil Pressure Alarm Test. (1) Alarm lamps in cab and on pump panel are energized by the same sender. (2) To test operation of the alarm, turn ignition ON, but do not start engine  Check both alarms sound. (3) If no alarm, check wire for continuity.  Wire number for pump panel is 113 and for cab is 42. Both wires run in same harness as gage circuits in a preceding (see step 3). (4) If wire is continuous, ground the wire from sender.  If alarm does not sound, replace alarm lamp. (5) If alarm lamp sounds in step 4, sender is faulty Replace  sender  (see  Illustration  for sender location). 4-449

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