The answer to 'why is my generator dimming lights' is that the generator is likely not producing enough power to meet the electrical demand. This can be caused by several factors, including an overloaded generator, a malfunctioning voltage regulator, or issues with the generator's engine.
When a generator is overloaded, it struggles to maintain the proper voltage and frequency, causing the lights to dim. This can happen if you're running too many high-wattage appliances or devices at the same time. A malfunctioning voltage regulator can also lead to voltage fluctuations, resulting in dimming lights. Additionally, problems with the generator's engine, such as low fuel, dirty air filters, or mechanical issues, can prevent the generator from producing enough power.