1. Connect a multimeter between the positive terminal (red wire) generator and mass.
2. To warm up the generator to operating temperature (around 80°C), the engine should rotate at a speed of 3000 to 4000 rpm for two minutes. During start voltage (at outside temperature 20°°C) can drop to 8 volts.
3. Turn on the parking light, radio or fresh air fan. This corresponds to a current consumption of 3 to 7 amperes. If the regulated voltage is now between 13.5 and 14.8 volts, then the generator and regulator are working. In order for the battery to be charged while the vehicle is in operation, the alternator voltage (on-board network voltage) there should be more battery voltage.
4. Turn on the high beam and repeat the measurement at an engine speed of 3000 rpm. The voltage can exceed the previously measured value by no more than 0.4 V.
5. If higher voltages are obtained during the measurement, then the regulator is faulty and must be replaced. If the voltage is too low, then this indicates wear on the contact carbons. In this case, dismantle the generator and take it to the electrical workshop for reassembly (see also the section on checking and replacing contact carbons).
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