UBS Hydro IITechnical data EN2018-05-02 57 / 6010.3 Electrical circuit diagrams10.3.1 Without batteryFig. 18: Version without battery1 Chassis / engine with dynamo machine2 Electric box with rectifier3 Dashboard panel / steering barG+ Rectifier plus-poleG- Rectifier minus-poleS1 Switch on the pumpS2 Dead man switchK1 Relay in electric boxMa Magnetic switch on valveO Terminal in cubic plugWire number