Why Do Diesels Have Two Batteries. Diesel trucks require two batteries to power the truck properly Yegor AleyevTASS via Getty Images. My question is is there anythin.
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It has a bigger motor that requires more power to turn over.
If you own or work on diesel trucks then you know that they have two batteries one for starting the engine and another that provides additional power when the vehicle is running. Why do wr have 2 battarys in our trucks do we run on 24 volts. Once the vehicles initial electrical needs are met lights stereo wipers it starts charging to provide continuous power. 12 Aug 11 2015.
