Which statement is true regarding diesel engines and battery levels?

Low battery levels can indeed affect the performance of diesel engines. Diesel engines rely on glow plugs to start in cold weather, which require battery power to function properly. If the battery level is low, the glow plugs may not heat sufficiently, making starting the engine difficult or even impossible in cold conditions. Additionally, the battery is critical for the electrical system, including the fuel injectors and other components essential for engine operation. Therefore, maintaining adequate battery levels is important not only for starting the engine but also for ensuring overall operational performance.