How to check whether the car generator generates electricity

The most direct and effective way to test whether a car generator generates electricity is as follows: first start the engine, then remove any wire on the battery to see if the instrument light is on, if it is on, it will generate electricity, and if it is not, it will not generate electricity. The principle is:

Under normal circumstances, the whole vehicle is supplied by the generator, the battery only plays a supplementary role, and the generator is supplied by the battery when it does not generate electricity, so after starting, only the generator is supplied when the battery line is disconnected, and it is clear whether the power is generated.

After getting into the car, use a tool to test whether there is suction at the pulley, and if there is no suction, it will definitely not generate electricity.

The second is to use a multimeter, and the third is to use a current clamp to check whether there is any current entering the battery after landing, if there is no power generation, there will be no current.

Older cars, such as diesel cars, can pull out the battery head after getting into the car, turn on the headlights to turn on whether they are on, and if they are not on, they will not generate electricity.

The failure of the generator is usually due to the grinding of the internal carbon brush or the failure of the silicon rectifier operation.

Dismantle the development of motors, see what reasons will cause the car to not generate electricity?

How to check if the car's generator generates electricity, this trick is too practical!

1. Adjust the engine speed to observe the brightness of the headlights.

When the engine is started, turn on the headlights, let the engine speed gradually increase from idle speed to medium speed, if the brightness of the headlights increases with the increase of speed, it means that the generator is working normally, otherwise it is not power generation.

2. Use the voltage level of the multimeter to detect.

Turn the multimeter knob to the DC voltage 30V gear (or use the general DC voltmeter appropriate gear), connect the red watch pen to the generator "armature" column, and the black watch pen to the shell, so that the engine runs above medium speed, the voltage standard value of the 12V electrical system should be about 14V, and the voltage standard value of the 24V electrical system should be about 28V. If the measured voltage is the battery voltage, it means that the generator does not generate electricity.

3. Another ammeter is connected for detection.

If there is no ammeter on the dashboard of the car, an external DC ammeter can be used to detect it. First remove the generator "armature" column wire, and then connect the positive pole of the DC ammeter with a range of about 20A to the generator "armature", and connect the negative wire to the above-mentioned removed joint. When the engine is running above medium speed (no other electrical equipment is used), the ammeter has a 3A 5A charging indication, indicating that the generator is working normally, otherwise the generator does not generate electricity.

4. Use car bulbs to measure.

If you don't have a multimeter and a DC meter, you can use a car bulb to test the light. Solder the bulb to the ends of the bulb with wires of the appropriate length and attach fish clips to both ends of the bulb. Before testing, remove the wire of the generator "armature" column, and then clamp one end of the test lamp to the generator "armature" column, and the other end of the iron, when the engine is running at medium speed, the brightness of the test lamp indicates that the generator is working normally, otherwise the generator will not generate electricity.

5. Take off the battery and tie to see if the engine works.

If there is no microcomputer control electronics on the car, it can be detected by this method. Control the engine above medium speed, remove the battery lap wire (generally disconnect the control master switch on the battery lap wire), if the engine is working normally, it means that the generator generates electricity, otherwise the generator is faulty.

1. Before acting, we should think and observe, and carefully study the fault.

1) What warning characteristics have appeared before the failure. Under normal circumstances, before the failure of the diesel engine, its speed, sound, exhaust, water temperature, oil pressure and other aspects will show some abnormal signs, that is, the characteristics of failure omen. Based on the characteristics of the omen, the staff can quickly make correct judgments and take decisive measures to prevent accidents.

For example, if the valve is leaking, the engine will emit black smoke; If the crankshaft pads and journals are worn too much, the engine will emit a muffled "boring" sound.

2) What repairs and maintenance work has been carried out prior to this. Usually some improper repair or maintenance will cause some faults, and the staff can find clues from these repairs or maintenance.

3) Whether there has been a similar failure before.

2. Start with the simplest and easiest reason to do.

Most faults are simple and easy to eliminate, and staff should check the easiest and obvious things first, so that they can save time, quickly find out the cause, troubleshoot, and reduce some unnecessary troubles. For example, "insufficient power" is usually caused by a loose throttle mechanism and dirty fuel filter; "Excessive oil consumption" is usually caused by leaks in gaskets and tubing fittings.

3. Repeat the inspection and thinking before starting the disassembly work.

Most engine failures do not originate from a single component, but can be traced back to the relationship between the components. In the process of troubleshooting, it is not uncommon for the entire engine to be dismantled in search of the cause of a fault, so that all the clues to the fault are destroyed during the dismantling process.

So it should be re-examined to see if an easy solution has been overlooked. For example, not charging is not only a governor failure, but it can also be caused by a loose fan belt.

4. Find out and eliminate the root cause of the failure.

After the mechanical failure is corrected, the root cause of the failure should be found out and eliminated, so as to avoid similar failures in the future. "Injector plunger bonding" can be solved by replacing the failed plunger, but there is always a factor that causes the plunger to stick, which may be caused by improper adjustment of the injector nozzle, or it may be caused by water in the fuel.

By following the above basic steps, you can fundamentally find out the cause of the fault and how to eliminate it, and you can avoid clutter and cluelessness.

So how can users use the current network technology to carry out professional fault diagnosis operations for generators. To avoid these failures as much as possible and improve work efficiency, Apple of the Industrial Internet of Things (IIoT) has built a first-class universal data collector based on the generator set health cloud platform to establish a universal data service platform.