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Checking the current output of the generator (2.7 L)
This test determines whether the current impact of the generator nominal value. Before the test, always check the following: - The installation of a generator and connecting wires; - The battery; - Alternator drive belt tension; - Fuse-link; - Absence of extraneous noise from the generator when the engine is running.
NOTE The battery used in conducting this test, should be slightly discharged. The load created by a fully charged battery, not suitable for the correct performance of this test. |
Turn the ignition switch to ?�OFF?�. Disconnect the (-) terminals of the battery
| Fig. 7.23. Driving test current output of the generator
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Disconnect the output wire from the terminal "B" of the generator. Connect an ammeter (DC, with a range of 0-100 A) in series between the output of the "B" and the output wire, disconnected from the generator. Connect the (positive) lead of the ammeter to the conclusion "B" of the generator, and then the (-) wire of the ammeter to the disconnected output wire from the generator (Fig. 7.23).
ATTENTION Use clamps (type "crocodile") when connected to an electrical circuit. Connections tighten the bolts and nuts. Otherwise, bad connection (using a clamp-type "crocodile") can happen a serious fault (or accident) caused by high current. |
NOTE We recommend using an ammeter with a sensor of the inductive type ("Clamp"), which enables current measurement without disconnecting the wires from the generator staff. |
Connect a voltmeter (with a scale of 0-20) between terminal "B" of the generator and "weight". (Connect () voltmeter lead to the conclusion that the "B" of the generator, and then the (-) lead of the voltmeter to the "masses.") Connect a tachometer or the control tester. Attach the wire to the (-) terminal of the battery. Leave the engine cover open. Check that the voltage shown by the voltmeter is equal to the battery voltage.
NOTE If the meter reads 0, then either it is broken or burned out fuse in the circuit between terminal "B" of the generator and (+) terminal of the battery. |
Start the engine and turn on the headlights. Turn on the main beam headlights and the heater fan switch is set to position ?�HIGH?�, then sharply increase the frequency of engine speed to 2500 min -1 and read the maximum value of the current impact of the generator (featuring an ammeter). Limit: 70% of the rated current output.
NOTE Rated current impact is shown in Table 7.1. |
Since the engine is started the current generated by the battery falls rapidly, the procedure of increasing the engine speed necessary to execute as soon as possible in order to have time to measure the maximum current output of the generator. The magnitude of return current will depend on the electrical load and the temperature of the generator housing. If during testing electrical load is small, the specified value of current the alternator will not be achieved, despite the fact that the generator is defective. In such cases, increase the electrical load (in order to discharge the battery), turn on while the main beam headlights with the engine off and then run the test again. The specified value of the current impact of the generator may not be obtained as a result of overheating of the generator frame or at too high ambient temperature. In such cases, allow the generator to cool down, and follow the test again. The ammeter reading should be higher than the maximum permissible value. If the ammeter below the limit value, and thus the circuit output ?�B?� generator is OK, then remove the generator from the car, and make an inspection on the stand. After checking, allow the engine to idle. Turn the ignition switch to ?�OFF?�. Remove the tachometer or the control tester. Disconnect the (-) battery terminals. Remove the ammeter and voltmeter. Connect the output wire to the conclusion "B" of the generator. Attach the wire to the (-) terminal of the battery.
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