TM 10-3930-669-20 CHAPTER 7 ELECTRICAL SYSTEM MAINTENANCE Para Contents Page 7-1 Introduction................................................................................................................................................7-2 7-2 Alternator Replacement .............................................................................................................................7-3 7-3 Alternator Belt Adjustment .........................................................................................................................7-6 7-4 Alternator Belt Replacement ......................................................................................................................7-8 7-5 Voltage Regulator Replacement ................................................................................................................7-11 7-6 Starter Assembly Replacement..................................................................................................................7-12 7-7 Glow Plug Replacement ............................................................................................................................7-14 7-8 Instrument Panel Replacement..................................................................................................................7-16 7-9 General Gauge Replacement ....................................................................................................................7-20 7-10 Hour Meter Replacement...........................................................................................................................7-23 7-11 Air Restriction Indicator Gauge Replacement.............................................................................................7-25 7-12 Cab Heater Blower Switch Replacement....................................................................................................7-27 7-13 Glow Plug Switch Replacement .................................................................................................................7-29 7-14 Engine Switch Replacement ......................................................................................................................7-31 7-15 Main Power Switch Replacement...............................................................................................................7-33 7-16 Front/Rear Lights Switch Replacement ......................................................................................................7-35 7-17 Master Cylinder Pressure Switch Replacement..........................................................................................7-37 7-18 Brake Switch Replacement ........................................................................................................................7-39 7-19 Transmission Speed Selector/Wiper Switch Replacement .........................................................................7-41 7-20 Transmission Shift Lever Replacement......................................................................................................7-44 7-21 Transmission Control Switch Replacement ................................................................................................7-46 7-22 Engine Temperature Switch Replacement .................................................................................................7-50 7-23 Drive Axle Oil Temperature Switch Replacement ......................................................................................7-51 7-24 Transmission Inching Valve Replacement .................................................................................................7-53 7-25 Gauge Lamp Replacement ........................................................................................................................7-55 7-26 Front/Rear/Mast Light Lamp Replacement.................................................................................................7-57 7-27 Taillight Lamp Replacement ......................................................................................................................7-58 7-28 Front Work Light Replacement ..................................................................................................................7-59 7-29 Rear Work Light Replacement...................................................................................................................7-61 7-30 Mast Light Replacement ............................................................................................................................7-63 7-31 Taillight/Stoplight Replacement .................................................................................................................7-65 7-32 Cab Interior Light Replacement .................................................................................................................7-67 7-33 Fuse, Relay, Diode, and Buss Bar Replacement........................................................................................7-69 7-34 Fuse Panel Replacement...........................................................................................................................7-74 7-35 Fuel Level Sensor Replacement ................................................................................................................7-77 7-36 Fuel Shutoff Solenoid Replacement...........................................................................................................7-80 7-37 Drive Axle Cooling Fans Replacement/Repair ...........................................................................................7-82 7-38 Shunt Assembly Replacement ...................................................................................................................7-85 7-39 Broken Belt Indicator Replacement............................................................................................................7-89 7-40 Broken Belt Sensor Replacement ..............................................................................................................7-91 7-41 Engine Oil Temperature Sensor Replacement ...........................................................................................7-92 7-42 Engine Oil Pressure Sensor Replacement .................................................................................................7-94 7-43 Transmission Oil Temperature Sensor Replacement .................................................................................7-96 7-1