Caution: Before servicing components of on-board electrical systems, familiarize yourself with the safety requirements for working with electrical devices.
The vehicle is equipped with a 12-volt on-board power supply system with negative grounding. Power is supplied to the lighting devices and other consumers from a lead-acid battery, which is recharged from an alternator. All components are connected to each other by wires, most of the contact connectors of the on-board electrical equipment circuits are made of plastic and are multi-contact. The reliability of the joint of the halves of such connectors is ensured by the snapping of the locking tongues built into the plugs of the locks. Before disconnecting such a connector, carefully study its design in advance - it is often not easy to determine the method of fixing its halves by eye; some connectors are equipped with several locking units. Pull only by the plug, and under no circumstances by the wiring harness, to avoid accidental damage to the contact terminals built into the connector.
This Chapter describes the repair and maintenance procedures for electrical components installed on the vehicle that are not directly related to engine operation. For information on servicing components such as the battery, alternator, and starter, refer to Chapter 5, Engine Electrical Systems. To avoid electrical shock or fire from an accidental short circuit, disconnect the negative battery cable or, in some cases, disconnect the battery completely before servicing any on-board electrical components—always follow the recommendations in Chapter 5. Regularly inspect the wiring harnesses for condition and for proper fastening to intermediate clamps, clips, and ties. Be careful not to rub the insulation off the wires when in contact with adjacent components.
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