Repair manual

Table of Contents GP
wc_br0163131en_005TOC.fm 6
3.17 Engine Electrical Schematic—GP 3800, GP/GPS 5600, GP/GPS 6600 .....46
3.18 Engine Components ......................................................................................47
3.19 Electrical Schematic—GP 4000 ....................................................................48
3.20 Electrical Schematic—GP 4000 CAN ............................................................50
4 Troubleshooting 52
4.1 Troubleshooting Methodology .......................................................................52
4.2 Checking Continuity .......................................................................................54
4.3 Checking Resistance .....................................................................................54
4.4 Checking Voltage ..........................................................................................54
4.5 Troubleshooting Flowcharts ..........................................................................55
4.6 No Voltage at Receptacles—Flowchart 1A ...................................................56
4.7 No Voltage at Receptacles—Flowchart 1B ...................................................57
4.8 Checking Voltage at Generator Terminal Strip ..............................................58
4.9 Checking Voltage at Plug—GP 2500A, GP 2600 ..........................................59
4.10 Checking Main and Rotor Windings ..............................................................60
4.11 No Voltage at Receptacles—Flowchart 1C ...................................................63
4.12 Checking Main Circuit Breaker and Receptacle Circuitry ..............................64
4.13 Low Voltage at Receptacles—Flowchart 2A .................................................66
4.14 Checking Brushes .........................................................................................67
4.15 Checking Excitation Winding .........................................................................68
4.16 Checking AVR’s Sensing Wires—GP 2500A, GP 2600 ................................70
4.17 Checking AVR’s Sensing Wires ....................................................................71
4.18 Confirming a Malfunctioning AVR ..................................................................74
4.19 Checking and Installing the Voltage Selector Switch (VSS) ..........................76
4.20 High Voltage Troubleshooting—Flowchart 3A ...............................................78
4.21 Auto Idle Circuit Troubleshooting—Flowchart 4A ..........................................79
4.22 Checking Voltage to Auto Idle Solenoid ........................................................80
4.23 Checking Auto Idle Circuitry Between Generator and Fuse ..........................82
4.24 Checking Auto Idle Circuitry Between Fuse and Auto Idle Unit .....................84
4.25 Engine Backfires—Troubleshooting Flowchart 5A ........................................86
4.26 Checking Anti-Afterfire Solenoid (AAS) Circuit—Honda Engine ...................88
4.27 Diagnosing GFI Tripping ................................................................................90