Hello, does anyone know the following phenomenon and can help me? Micra K11 with 40 kW engine, technically completely (?) intact, 100 Tkm mileage. As soon as light or air conditioning are switched on, a spinning to screaming noise comes out of the engine compartment. There are no further impairments, one can drive with it hundreds of kilometers without the noise changes or smells occur. Turn off light – noise is gone (or so quiet that no longer audible?). Light on – G battery, Lima etc. are OK, that’s what an autoelectrician has looked at (Kfz electrician master, self-employed for over forty years, absolute professional!). He has found nothing. The V-belts are in order and really tense. In addition, the following demonstration effect: in the stand you don’t hear the noise and sometimes it doesn’t occur at all! However, when it occurs, it gets louder depending on the speed and becomes extremely annoying when driving on the highway at night. Every time the sound is heard, another phenomenon occurs in parallel: as soon as an electrical consumer is switched on, the radio is running out for a short time. So every time the brakes, flashing, disc lifter operation, etc. What can that be?! Has anyone ever had to do with a similar error? I am grateful for every hint…