1, the central distribution box is to distribute the electricity of the generator and the positive electrode of the battery to the various electrical appliances, its role is to distribute power and protect each circuit.
2, vehicle-mounted electrical appliances each circuit must have a fuse protection, the fuse is uniformly arranged in the central distribution box, circuit connection is: power supply -> insurance -> switch -> with electrical -> grounding.
In addition, some electrical appliances need to be controlled by relays, such as headlights, fog lamps, blowers... These relays are also arranged in the distribution box.
3. There are two power distribution boxes on a car, one installed in the engine compartment and the other in the cockpit. Waterproof protection should be done according to different environments.