When the suspect is suspected of failure, you can initially detect the car, remove the alternator does not disassemble further detection. The tools used to detect can be multimeter, general DC voltmeter, DC ammeter and oscilloscope.

How to detect the alternator without a multimeter in the absence of a car alternator?

Turn the multimeter knob to the DC voltage 30V file, the red pen connected to the motor "armature" then column, black pen then shell, so that the engine running in the speed above, 12V electrical system voltage value should be about 14V, 24V electrical The system voltage standard value should be about 28V. If the measured voltage is the battery voltage, it indicates that the china alternator is not generating power.

Can also use car lights, flashlight homemade small test lights, etc., but also by changing the state of the car to detect.

Start the engine, turn on the headlamps, so that the engine speed from the idle speed gradually increased to medium speed, headlamps brightness increases with the increase in speed, indicating that the china alternator is working properly, otherwise no power generation.

When there is no computer control electronic device, you can use this method to detect. The engine control in the speed above, remove the battery to take the line (usually disconnect the battery on the line control the main switch), if the engine is working properly, indicating that the alternator power generation, otherwise the alternator is faulty.

The flashlight at both ends connected to the wire made of small test lights, connected to the alternator "armature" and between the shell. Use the wires to connect the positive and negative poles of the battery (or the same voltage) to the two magnetic fields of the alternator. The "F1" and "F2" ("AC" ), Let the battery to the china alternator excitation. Quickly turn the engine belt by hand, a small test light that the alternator is working properly, otherwise the alternator does not generate electricity.

There is no tool, then the alternator can not be removed to check, so only in the car inspection. Do not rely on any tools, then the hands can only be used on the car parts, we can use the alternator with a close engine to monitor.

When there is no computer control of electronic devices, you can use this method to detect:

First start the engine, and then open the headlamps, so that the engine speed from the idle speed gradually increased to medium speed, headlamps brightness increases with the increase in speed, indicating that the alternator is working properly, otherwise no power generation. This is a relatively simple method, there is a way, but need to remove the battery cable line, and then see if the engine is working.

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