In the on-board electrical system, contact X unloading relay (by the way, a simple switching relay) plays a significant role. Therefore, the principle of its operation is described here:
Contact X of the ignition switch is only energized when the ignition key is in the «drive». Powerful current consumers, such as a windshield wiper, heated rear window or fan, are connected to this terminal so that when the engine is started, all «force» the battery went to work the starter.
Of course, not all of these consumers can receive their power through a contact in the ignition switch; he is too weak for that. Therefore, a relay must be connected between them, and power is supplied through it. Ignition switch contact (along with the power supply for the headlights) only for the switching current to the relay.
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