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generator begins producing sufficient current, it also The Y type stator winding connections deliver the induced AC current to 3 positive and 3 negative Noise emitting from the generator may be caused by: • Worn, loose or defective bearings • Loose or defective drive pulley • Incorrect, worn, damaged or misadjusted drive belt • Loose mounting bolts • Misaligned drive pulley • Defective stator or diode ELECTRONIC VOLTAGE REGULATOR The Electronic Voltage Regulator (EVR) is not a separate component. It is actually a voltage regulat- Operation: The amount of DC current produced by the generator is controlled by EVR circuitry con- Voltage is regulated by cycling the ground path to control the strength of the rotor magnetic field. The DIAGNOSIS AND TESTING CHARGING SYSTEM When the ignition switch is turned to the ON posi- tion, battery potential will register on the voltmeter. on the meter. With the engine running, a voltage The following are possible symptoms of a charging system fault: • The voltmeter does not operate properly • An undercharged or overcharged battery condi- tion occurs. Remember that an undercharged battery is often caused by: • Accessories being left on with the engine not running • A faulty or improperly adjusted switch that allows a lamp to stay on. See Ignition-Off Draw Test The following procedures may be used to correct a problem diagnosed as a charging system fault. INSPECTION (1) Inspect condition of battery cable terminals, battery posts, connections at engine block, starter (2) Inspect all fuses in the fuseblock module and Power Distribution Center (PDC) for tightness in (3) Inspect the electrolyte level in the battery. Replace battery if electrolyte level is low. (4) Inspect generator mounting bolts for tightness. Replace or tighten bolts if required. Refer to the Gen- (5) Inspect generator drive belt condition and ten- sion. Tighten or replace belt as required. Refer to (6) Inspect automatic belt tensioner (if equipped). Refer to Group 7, Cooling System for information. (7) Inspect connections at generator field, battery output, and ground terminals. Also check ground con- 8C - 2 CHARGING SYSTEM 300M DESCRIPTION AND OPERATION (Continued) |