Why does your diesel truck have two batteries?
Vehicles with diesel engines require more cranking power to get the engine started. This is because diesel engines have much higher compression in the cylinders than gasoline engines. A diesel engine uses the heat from compression to ignite the fuel. So, it takes more energy to rotate the starter fast enough to create enough heat and compression to start firing. In colder weather two batteries are a must have for a diesel as the fuel becomes thicker in colder temperatures and is harder to ignite
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