1. Inspection Precautions
(1) Before disconnecting the charging system wires, first disconnect the battery ground cable.
(2) Do not connect the battery ground cable until all wire connectors are connected.
(3) Avoid touching the alternator output terminal. This terminal will be very hot when the battery cable is connected.
(4) When installing the battery, carefully identify the polarity of the battery. If the polarity of the cable is reversed, the diode will be damaged. When connecting the auxiliary battery, you also need to make sure the polarity is correct, so that the positive terminal is connected to the positive terminal and the negative terminal is grounded.
(5) Keep hair, clothing and jewelry away from moving parts.
2. Routine Inspection Items
(1) Drive belt inspection, as shownin Figure 4-145.
Figure 4-145 Alternator Drive Belt Inspection
① Every time the car travels 15,000 km, the drive belt deflection of the The alternator must be checked and adjusted.
② Check the appearance of the drive belt. Observe cracks and damage and replace if necessary.
③ Check the deflection of the drive belt. Apply 100 N of pressure to the center of the drive belt between the two drive pulleys. At this point, the drive belt deflection should correspond to the specified indicators. The new drive belt is usually 5-7mm and the old drive belt is usually 10-14mm. If the deflection does not meet the requirements, it must be adjusted.
(2) Check the wire connection.
(3) Check whether the generator installation bolts and generator wiring bolts arehave loosened.
(4) Check whether the insulating pads are effective everywhere, and check whether the generator output wires are connected to the engine oil pipes, air pipes, etc.
(5) Check if there is any operating noise.
3. Check the power generation status of the generator
(1) Check the charging indicator light. When the ignition is on but the engine does not start, check to see if the instrument charge light is on. If it does not light up, check the corresponding circuit, the indicator bulb and the charging indicator fuse. Start the engine. The charging light should go out when the engine is running normally, otherwise the generator should be checked.
(2) Inspection of the excitation circuit. With the ignition switch on, use a metal object to check if the generator rotor shaft is magnetic. If so, it means the generator excitation circuit is good. Otherwise, check thee generator excitation circuit for the input voltage. If voltage is present, check the voltage regulator and field winding for damage.
(3) Inspection of generator operating condition. Use a multimeter to check the generator output voltage while the engine is running. The generator output voltage should be approximately 14 V at 2500 rpm.