With the invention of the vehicle, the world has changed considerably. At the beginning, they were primitive vehicles that used only human strength, but development has come up with new solutions that we know today. By utilizing fuel, and then electricity in the auto industry, it is possible to have a better development of the vehicle, their work, and safety. With regard to the development of vehicles themselves, they have a special role to play with electric devices and spend. It is precisely the electric energy that is the initiator of the vehicle because if the battery is empty, the vehicle will not start. Also, if there is a problem with the alternator, the vehicle battery will not be charged. Electrical consumables found on many vehicles are electric motors, electric motors, and ignition systems. All of these together enable efficient vehicle control. Today's vehicles can not be imagined without the use of various electric-powered motors. This is why often vehicles have problems with electrical connections or similar problems related to electric energy in the vehicle. Such problems can be the nightmare of any vehicle owner, which is why this area needs to be well known. In this final work, the described thermodynamic process was studied and described in the four-stroke diesel engine type F 6L 413 F for the propulsion of a road vehicle, direct, indirect and electronic control of fuel injection into the compression area. Electrical devices and systems for road vehicles have been studied and analyzed. The electrical system and its maintenance on the car TAM 150 T 11 B / BV - 6x6 were thoroughly analyzed.