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REPLACEMENT - TM-5-4210-220-12_535
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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REPLACEMENT - TM-5-4210-220-12_537
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM 4-24.1  Alternator This task covers a. Test b. Replacement c. Repair TOOLS MATERIALS/PARTS Shop Equipment, Automotive 1105465 Alternator Maintenance and Repair, NSN 4910-00-754-0650 EQUIPMENT CONDITION Main Engine Shutdown (see para. 2-10) APU Shutdown (see para. 2-12) Battery Switch OFF 110 Volt Inverter OFF LHS and RHS Engine Cover Removed (see para. 4-12.11) TEST NOTE If the batteries are undercharged carry out tests 1 thru 11.  If the batteries are overcharged, or showing low electrolyte level, carry out test 12 thru 14. (1) Be  sure  undercharging  is  not  a  result  of  accessories  being  left  on.    With  all  accessories  off  and  battery switch set to BOTH and batteries charged, connect a voltmeter between the terminals of the current shunt. The reading should be zero even in the millivolt range.  If there is a reading, check for a broken accessory switch or an accessory circuit connected directly to the battery bus bar.  The current shunt is mounted on the left hand engine lifting bracket. (2) Be sure alternator drive belts are tight.  There should be a maximum 1/2 in. (12 mm) play in drive belt at the mid-position between the pulleys. (3) Be sure all battery, starter motor, alternator, and ground connections are tight and clean.  Be sure battery posts are not coated with corrosion products. (4) Switch ignition on and note dash-mounted voltmeter reading.  A zero reading indicates wire 22 or 21 or the wires  between  the  batteries  and  battery  switch  are  broken.    It  may  also  indicate  a  fault  with  the  battery switch or the ignition switch.  Check all wire and switches and replace failed components. Change 4    4-412

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