DESCRIPTION & OPERATION
The charging system includes a battery, a generator with an internal regulator, charging indicator light and wire. The generator has 6 built-in diodes (3 positive and 3 negative), each rectifying an AC current to DC current. Therefore, the DC current appears at generator "B" terminal. In addition, the charging voltage of the generator is regulated by the battery voltage detection system. The main components of the generator are the rotor, stator, rectifier, capacitor brushes, bearings and "V" ribbed drive belt pulley. The brush holder contains a built-in electronic voltage regulator.
The generator generates AC voltage in its windings by a belt driven by the engine. The rectifier converts this AC voltage to DC voltage. The voltage regulator, a component which is included in the generator frame, has a primary function of controlling the generator's output to meet electrical system requirements. The regulator also controls the charge warning lamp. Fuse No. 18 supplies battery voltage to the charge warning indicator. With ignition ON and engine OFF, terminal "L" of the regulator is grounded internally and the indicator lights up. A small amount of current provided by both the charge warning lamp and the pre-excitation resistor is used to excite the magnetic field windings to start the charging process. With the engine running and the generator charging, terminal "L" voltage rises and the indicator goes out. If the generator fails to charge, terminal "L" remains below battery voltage and the indicator remains lit.
When electrical loads (head lights, A/C system, etc.) are applied, the current into the rotor coil changes. The "FR" terminal in the generator monitors the current change and sends signal to the ECM. According to the signal, the ECM controls the "G" terminal (Ground) in the generator, controlling the output.
Test Description
This test determines if the wiring between the generator "B" terminal and the battery positive terminal is good by the voltage drop method.
This test determines if the generator gives an output current that is equivalent to the nominal output.
The purpose of this test is to check that the electronic voltage regulator controls the voltage correctly.