To provide a simple, low-cost current feeding system capable of preventing an atmospheric pollution with the exhaust gas from cars of such a structure that a current control circuit and proprietary battery are installed separately from an on-vehicle main battery whereby it is practicable to supply the power for working only with the proprietary battery from an operation switch installed in the current control circuit where no engine key is required when engine is at a standstill so that on-vehicle audio device, etc., are operated for several hours.

A proprietary battery 1A and current control circuit 5A are put in connection at all times through connectors 2 and 3 while a feeder line 6 is put in direct coupling with a feeder line 8 of the vehicle body, and during the engine being in operation, the battery 1A is automatically charged regardless of how the operation switch 5Ca installed in the current control circuit 5A is manipulated, and the power for working is supplied through manipulation of the operation switch 5Ca when the engine is at a standstill, and the electric connection between the battery 1A and feeder line 6 is made and broken so that actuation of the on-vehicle audio device 12, etc., is made practicable, and necessity for idling in parking is eliminated.