挖掘机启动电路若发生故障,可造成其发动机不能正常启动,或启动后熄火。本文针对挖掘机因电路故障无法启动问题,进行原因分析,并提出排查方法。1.启动电路组成某型挖掘机启动电路主要由蓄电池1、电源总开关2、蓄电池继电器3、启动继电器4、启动机5、保险6、启动保护继电器7、卫星定位系统(GPS)8、点火开关9、断油阀继电器10、断油阀11以及线束等组 Excavator starting circuit failure, can cause the engine can not start normally, or start after the flame. In this paper, excavators for circuit failure can not start the problem, the reasons for the analysis, and put forward troubleshooting methods. 1. Start-up circuit composed of a excavator starter circuit mainly by the battery 1, the power switch 2, the battery relay 3, start the relay 4, the starter 5, insurance 6, start the protective relay 7, the satellite positioning system (GPS) 8, ignition Switch 9, the fuel valve relay 10, the fuel valve 11 and the harness group