ON Delay, Load Response Function, Alternator Voltage Regulator

Load Response Function, Alternator Voltage Regulator

The alternator current changes abruptly by switching major loads. This load results in engine speed fluctuations when the engine is running at idle speed or at low speeds. In order to prevent this disturbance the load response function of the alternator limits the power increase at low engine speeds as engine operation is particularly susceptible to disturbances at these low speeds. The current increases at a rate of approx. 10 A per second at engine speeds below 1000 rpm. An unavoidable side effect of this function is fluctuations in the brightness of the headlights at idle speed.
The load response function is not active at medium and high engine speeds.
Fluctuations in the brightness of the headlights at engine speeds above 1000 rpm are an indication of a faulty voltage regulator.