Electronic intermittent windscreen wiper control - with transistor switching circuit to prevent overloading of relay contacts in park setting

The intermittent control for the windscreen wiper has a transistored switching circuit connected directly to the switching relay with a fail-safe circuit which prevents overloading of the relay contacts when the wiper is activated while blocked in the park position. The wiper motor and the switching relay remain active until the wipers are switched off by the ignition switch, safety cut-out or main switch. The fail safe circuit includes an astable switching transistor between the motor contacts and the positive current supply.