Auxiliary Battery Charging

The auxiliary battery is an option and can be used to supply electrical power to additional equipment that the customer may choose to add, without discharging the vehicle's primary battery. The auxiliary battery relay closes when the engine is running, in order to allow the generator to charge the auxiliary battery. The relay opens when the engine is off, so that the accessories are powered only by the auxiliary battery and will not discharge the vehicles primary battery, which is used for engine starting.