General Information
Often when problems with the charging system are being investigated, the alternator is not the problem. If a low battery condition is present, test the batteries first. See Special Instruction, SEHS7633, "Battery Test Procedure" for more information. If the engine cranks slowly, then test the starting system. See Service Magazine, SEPD0020, "Testing The Starter On The Engine" for more information. If a warning indicator for the charging system is ON, see Service Magazine, SEBD1751, "Difference Between Alternator Indicator In Electronic Monitoring System (EMS) And Low Voltage Indicator In Operating Monitoring System (OMS)". When a problem with the charging system is suspected, then complete the testing that is described in Diagnostic Function, "Charging System".
Caterpillar Information System:
Alternator - Delco 27SI Component Description
12H, 140H, 143H, 160H and 163H Motor Graders Hydraulic and Steering System Steering Cylinder
G3520B Engines E868 Gas Flow Control Valve Malfunction
G3520B Engines E867 Improper Gas Flow Control Valve Response
Alternator - Delco 27SI Normal Operation
C0.5, C0.7, C1.1/3011C, C1.5/3013C, C1.6 and C2.2/3024C/3024CT Industrial Engines and Engines for Caterpillar Built Machines Crankshaft
G3520B Engines E242 Engine Overload
G3520B Engines E226 Driven Equipment Not Ready
C0.5, C0.7, C1.1/3011C, C1.5/3013C, C1.6 and C2.2/3024C/3024CT Industrial Engines and Engines for Caterpillar Built Machines Cylinder Block
Alternator - Delco 27SI General Information
G3520B Engines E004 Engine Overspeed Shutdown
C0.5, C0.7, C1.1/3011C, C1.5/3013C, C1.6 and C2.2/3024C/3024CT Industrial Engines and Engines for Caterpillar Built Machines Water Temperature Regulator
Alternator - Delco 27SI Service Tools
3524B Engine for Caterpillar Built Machines Alternator - Remove and Install
Alternator - Delco 27SI Alternator
C0.5, C0.7, C0.7, C1.1/3011C, C1.5/3013C, C1.6 and C2.2/3024C/3024CT Industrial Engines and Engines for Caterpillar Built Machines Starting the Engine
Alternator - Delco 27SI Alternator - Disassemble
C0.5, C0.7, C0.7, C1.1/3011C, C1.5/3013C, C1.6 and C2.2/3024C/3024CT Industrial Engines and Engines for Caterpillar Built Machines Cold Weather Starting
C-10, C-12 and C-15 On-highway Engines System Overview
Alternator - Delco 27SI Alternator - Assemble
C-10, C-12 and C-15 On-highway Engines Sensors and Electrical Connectors
C-10, C-12 and C-15 On-highway Engines Selected Engine Rating
C11, C13 and C15 On-highway Engines Cruise Control Parameters
G3520B Engines +8V Sensor Voltage Supply