Caterpillar - Service Training Course Materials

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STUDENT REFERENCE MATERIALS
12-V AND 24-V ELECTRICAL SYSTEMS

TABLE OF CONTENTS
Maintenance-Free Batteries Require Different Troubleshooting Procedures .......4
Preventive Maintenance For Batteries...........................................5
Alternator/Generator Output Test On The Engine.................................6
Testing The Starter On The Engine .............................................7
Jump Starting Procedures......................................................11
How To Determine If Relays Are Functioning Correctly..........................12
Be Sure Battery Cable To Starter Connection Has Correct Torque................15
Electrical System Damage From High Voltage ...................................16
Understanding Four Wire Windshield Wiper Motors (12 & 24V)....................17
Procedure For Replacing Batteries Or Battery Cables ..........................18
Procedure For Replacing Batteries Battery Cables Or Disconnect Switches.......18
Procedure For Replacing Batteries, Battery Cables Or Disconnect Switches......18
Understanding Causes Of Blown Fuses And Tripped Circuit Breakers .............19
Understanding Circuit Breakers................................................20
Understanding "Shorts," "Opens" and "Intermittents"...........................21
How To Troubleshoot A Short-To-Ground In Power Wiring.........................22
Limitations On Engine Cranking Time...........................................22
Description Of Service Code Information.......................................23
Explanation of "Pull Up Voltage"..............................................25
Machine Electrical Systems Schematics with New Format ........................26