Preparing for the test
Before starting the test, perform the following checks and repair any faulty parts or assemblies if necessary.
Check the condition of the battery installed in the vehicle.
Note: The battery used for this test must be slightly discharged. The load of a fully charged battery is not suitable for performing this test accurately.
Check the tension of the alternator drive belt.
Turn the ignition key to the "OFF" position.
Disconnect the cable from the negative (–) battery terminal.
Disconnect the standard wire from the generator terminal "B".
Connect an ammeter (DC, 0-100A range) in series between the alternator terminal "B" and its standard wire. Make sure that the (-) wire of the ammeter is connected to the standard wire disconnected from the alternator.
Note: Make sure each connection is secure and tight, as the terminals will carry a large amount of current. Do not use clips (alligator clips) when connecting to an electrical circuit.
Fig. 7.11. Generator output current test diagram
Connect a voltmeter (0-20 V scale) between the generator terminal "B" and the ground. Connect the (+) lead of the voltmeter to the generator terminal "B" and then the (-) lead of the voltmeter to a suitable ground (to the body) (Fig. 7.11).
(The original can be found on the resource: www.hyundaibook.ru)
Connect the test tachometer according to the manufacturer's instructions. Connect the wire to the (–) terminal of the battery.
Leave the engine hood open.
Verification procedure
Make sure the voltmeter shows battery voltage. If the voltmeter shows 0 V, then either there is an open circuit between the alternator "B" terminal and the (-) battery terminal, or the fuse has burned out, or there is a poor ground connection.
Start the engine and turn on the headlights.
Turn on the high beam headlights and set the heater electric fan switch to the "HIGH" position, then sharply increase the engine speed to 2500 min⁻¹ and read the maximum value of the generator output current (shown by the ammeter).
Note: After the engine starts, the charging current drops quickly. Perform the test as quickly as possible to measure the maximum value of the generator output current.
Analysis of results
The ammeter reading should be above the maximum permissible value. If the ammeter reading is below the maximum permissible value, and the generator terminal "B" circuit is in good condition, remove the generator from the vehicle and test it on a bench.
Maximum permissible value:
- generator 75 A - minimum 52.5 A.
- generator 90 A - minimum 63.0 A.
Note: The generator's rated output is stamped on a plate attached to the generator housing.
Note: The output current varies depending on the generator load and the generator case temperature, so the rated output current may not be achieved. In such cases, to increase the electrical load (to discharge the battery), turn on the high beam headlights for a while or connect the external lighting system of another vehicle.
Note: The rated value of the generator output current may also not be obtained due to overheating of the generator housing or too high ambient air temperature. In such cases, allow the generator to cool down and recheck.
After completing the generator output current test, gradually reduce the engine crankshaft speed to idle speed, then turn off the ignition.
Disconnect the cable from the negative (–) battery terminal.
Remove the ammeter, voltmeter and control tachometer.
Connect the standard wire to the "B" terminal of the generator.
Connect the cable to the negative (–) terminal of the battery.