Car Alternator Making noise?

If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.

Noises that come from the AC generator can be from three sources. The causes of the noises are identifiable by the type of noise they make. A loose belt will make a squealing noise. Check the belt condition and tension. Replace the belt if necessary.

Squealing

A squealing noise can also be caused by faulty bearings. The bearings are used to support the rotor in the housing halves. To test for bearing noises, use a length of hose, a long screwdriver, or a technician's stethoscope. By placing the end of the probe tool close to the bearings and listening on the other end, any bearing noise will be transmitted so you will be able to hear it. Bearing replacement will require disassembly of the AC generator.

CAUTION
This test is performed with the engine running. Use caution around the drive belts, fan, and other moving components.

Whining

A whining noise can be caused by shorted diodes or stator, or by a dry rotor bearing. A quick way to test for the cause of a whining sound is to disconnect the wiring to the generator. Then start and run the engine. If the noise is not there, the cause of the noise is a magnetic whine due to shorted diodes or stator windings. Use a scope to verify the condition of the diodes and stator. If the noise remains, the cause is mechanical and probably due to worn bearings.

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For more help,related to car Alternator,check out the list below:----

How to inspect Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html

How to Test Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-vehicles-alternator.html

How to Service Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-service-vehicles-alternator.html

How to Replace Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html

How to monitor Vehicles charging system?

http://repairhelpcenter.blogspot.com/2011/11/how-to-monitor-vehicles-charging-system.html

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For more car related problem troubleshooting:---

This are the sections, you can go through and click the link to read its troubleshooting.

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The car will not start?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-start.html

-----------------

Car will not crank?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-crank.html

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Car has no spark?

http://schematicsdiagram.blogspot.com/2011/06/car-has-no-spark.html

-------------

How to troubleshoot car battery?

http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-car-battery.html

-----------------

How to test starter solenoid?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

--------------------

How to test cars starter?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html

How to replace starter in car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-starter-in-car.html

-----------

car will turn over but will not start?

http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html

-----------------

Car wont start?

http://howtobyme.blogspot.com/2011/10/car-wont-start.html

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How to monitor Vehicles charging system?

If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.

It is very important to monitor charging system performance during the course of vehicle operation. Vehicles are equipped with an ammeter, voltmeter, or indicator light. These allow the driver to monitor the charging system.

Ammeter

The ammeter is placed in series with the circuit to monitor current flow into or out of the battery.

Ammeter connected in series with the charging system to monitor its operation.

When the AC generator is delivering current to the battery, the ammeter shows a positive (+) indication. When not enough current (or none at all) is being supplied, the result is a negative ( - ) indication. This is because the current flow is in the opposite direction, from the battery to the electrical system.

Indicator Light

This is the simplest and most common method of monitoring AC generator performance. When the charging system fails to supply sufficient current, the light turns on. However, when the ignition switch is first activated, the light also comes on. This is due to the fact that the AC generator is not providing power to the battery and other electrical circuits. Thus, the only current path is through the ignition switch, indicator light, voltage regulator, part of the AC generator, and ground, then back through the battery.

Electronic regulator with an indicator light “on” due to no AC generator output.

Only the battery, regulator, and alternator are in the circuit. With no current flowing through the indicator light, it goes out.

With the engine running, the indicator light comes on again if the electrical load is more than the AC generator can supply. This occasionally happens when the engine is idling. If there are no problems, the light should go out as the engine speed is increased. If it does not, either the AC generator or regulator is not working properly.

On late-model cars, the indicator light can be combined with the oil pressure warning light; it usually is labeled "engine." If this light turns on while the engine is running, either the AC generator is not charging or the oil pressure is low - or both.

Voltmeter

Voltmeters indicate the amount of voltage across an electrical circuit. The voltmeter shown below measures battery voltage when the ignition switch is in the run position.

Voltmeter connected to the charging circuit to monitor its operation.

A fully charged battery indicates just over 12 volts. As energy is taken from the battery, the voltmeter reading drops. At the same time, the voltage regulator senses this and raises the charging voltage output to 14 volts or more. When the battery has been recharged, the AC generator cuts back. The voltmeter now shows the fully charged battery voltage of just over 12 volts again. This on again, off again action of the AC generator is constantly monitored by the voltmeter.

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For more Alternator help,check out the list below:----

How to inspect Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html

How to Test Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-vehicles-alternator.html

How to Service Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-service-vehicles-alternator.html

How to Replace Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html

For more car related problem troubleshooting:---

This are the sections, you can go through and click the link to read its troubleshooting.

---------

The car will not start?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-start.html

-----------------

Car will not crank?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-crank.html

-----------

Car has no spark?

http://schematicsdiagram.blogspot.com/2011/06/car-has-no-spark.html

-------------

How to troubleshoot car battery?

http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-car-battery.html

-----------------

How to test starter solenoid?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

--------------------

How to test cars starter?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html

How to replace starter in car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-starter-in-car.html

-----------

car will turn over but will not start?

http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html

-----------------

Car wont start?

http://howtobyme.blogspot.com/2011/10/car-wont-start.html

----------

How to Replace Alternator?

If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.




Before directly,going to replace alternator,its advisable to inspect,test and try alternator servicing.But if all that is not helping then get the Alternator replaced.


Alternator testing,servicing and replacing instructions are as follows :---

How to inspect Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html

How to Test Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-vehicles-alternator.html

How to Service Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-service-vehicles-alternator.html

For Alternator replacing procedure,the details are as follows :---

Follow service manual procedures given by the manufacturer for the generator you are working on for disassembling, inspecting, testing, and rebuilding AC generators. Remember, improper connections to an AC generator can destroy it.

AC generator removal varies according to the engine size, engine placement, and vehicle accessories (such as power steering and air conditioning). The following is the typical procedure for removal and replacement of the AC generator.

• Place fender covers over the fenders
• Disconnect the battery ground cable

CAUTION
Never attempt to remove the alternator or disconnect any wires to the alternator without first disconnecting the battery negative cable.It's a good practice to wrap the cable with tape or insert the cable inside a rubber hose to prevent accidental contact with the battery terminal.Always wear safety glasses when working around the battery.

• Disconnect and label the wiring harness connections to the alternator (Painters Masking tape works very well for labeling Automotive wiring).
• Loosen the alternator pivot bolt.
• Remove the bolt that attaches the alternator to the adjustment arm.
• Rotate the alternator to loosen the drive belt and disengage the belt from the pulley. Be careful that any spacers that are used in mounting are kept with their original bolts. This will make correct reinstallation much easier.
• While supporting the alternator remove the pivot bolt.
• Remove the alternator from the vehicle.

To reinstall the alternator, reverse the removal procedure.

To adjust the belt tension, leave the pivot and adjusting arms loose. Look up the belt tension specification for the vehicle you are working on. Using a belt tension gauge on the belt apply pressure to the alternator until the correct belt tension registers on the gauge and tighten the mounting and adjustment bolts to the specified torque specification.

CAUTION
Over tightening of the alternator drive belt will cause the unit to whine and premature failure of the alternator drive end bearing, the water pump or the engine crankshaft.

------------

For more car related problem troubleshooting:---

This are the sections, you can go through and click the link to read its troubleshooting.

---------

The car will not start?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-start.html

-----------------

Car will not crank?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-crank.html

-----------

Car has no spark?

http://schematicsdiagram.blogspot.com/2011/06/car-has-no-spark.html

-------------

How to troubleshoot car battery?

http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-car-battery.html

-----------------

How to test starter solenoid?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

--------------------

How to test cars starter?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html

How to replace starter in car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-starter-in-car.html

-----------

car will turn over but will not start?

http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html

-----------------

Car wont start?

http://howtobyme.blogspot.com/2011/10/car-wont-start.html

----------

How to Test Vehicles Alternator?

If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.


Before testing Alternator,its always advisable to inspect alternator.
For that click this link below and go through alternator inspecting procedure.

How to inspect Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html

After you inspect the alternator,continue Alternator testing details as follows :-----

Current Output Test

The condition of the charging system can be checked by testing AC generator current output. The exact test procedures vary according to the vehicle and AC generator model. Some test procedures call for connecting an ammeter in series between the AC generator output terminal and the positive battery terminal. A carbon pile regulator is then connected across the battery terminals. The engine is then operated at moderate speeds and the carbon pile adjusted to obtain maximum current output. This reading is compared against the rated output. Normally, readings more than 10 amperes out of specifications indicate a problem.

When performing a current output test, the use of an inductive ammeter is highly recommended. an inductive ammeter eliminates the need to break battery connections. if you must break connections to hook up an ammeter, make sure you do not create an open circuit any time the ac generator is generating current.

Other current output tests can be done by hooking up a voltmeter, ammeter, and carbon pile.

Ammeter, voltmeter, and carbon pile hook-up for a current output test on an AC generator with an internal voltage regulator.

With the engine running at a set speed, the carbon pile is adjusted to obtain the specified voltage reading. The ammeter will then read the system's current output. Always follow the appropriate instructions when conducting a current output test.

Regulator By-Pass Test

If no or low voltage or current output is indicated, bypassing the voltage regulator by full-fielding the AC generator will tell you if the generator is bad. The exact procedure for full-fielding an AC generator, which makes it produce maximum output current, varies according to the application. On AC generators where the terminals are not very accessible, jumper wires may be needed to make the connections. Many new model AC generators cannot be full fielded at all.

On some internal regulator AC generators, full-fielding can be done by inserting a screwdriver through a special hole on the back of the unit.

Grounding the field terminal with a screwdriver inserted into a special test hole on the back of the AC generator.

The normal procedure for full-fielding an A-circuit AC generator is to ground the field terminal. If the A-circuit generator has two field terminals, ground one and feed battery positive voltage to the other to full-field the AC generator. With B-circuit AC generators, the generator is full-fielded by connecting the field terminal to battery positive.

An A-circuit AC generator has one carbon brush connected to positive battery voltage and the voltage regulator switches between field and negative to control output. With B-circuit systems, one brush is connected to the negative of the battery and the regulator switches between field and positive to control output. If an A-circuit regulator loses positive voltage, the AC generator will overcharge if the field coils still have power. If the A-circuit regulator loses its ground, the system will go dead.

In B-circuit AC generators, the opposite is true. If a B-circuit system loses ground, it will overcharge. If it loses positive voltage, it will go dead.

If full-fielding an AC generator suddenly brings charging system voltage or current output up to specifications, the voltage regulator, not the generator is at fault. If charging output is still low or nonexistent when full-fielding, the generator is bad.

Component Testing

A faulty AC generator can be the result of many different types of internal problems. Diodes, stator windings, and field circuits may be open, shorted, or improperly grounded. The brushes or slip rings can become worn. The rotor shaft can become bent and the pulley can work loose or bend out of proper alignment.

To test the components of an ac generator it must be removed and disassembled.

Using an ohmmeter to test a diode trio.

Testing a stator for opens.

Testing a rotor for opens.

Testing a stator for a short to ground.

Testing a rotor for a short to ground.


------------------

For more car related problem troubleshooting:---

This are the sections, you can go through and click the link to read its troubleshooting.

---------

The car will not start?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-start.html

-----------------

Car will not crank?

http://schematicsdiagram.blogspot.com/2011/06/car-will-not-crank.html

-----------

Car has no spark?

http://schematicsdiagram.blogspot.com/2011/06/car-has-no-spark.html

-------------

How to troubleshoot car battery?

http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-car-battery.html

-----------------

How to test starter solenoid?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

--------------------

How to test cars starter?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html

How to replace starter in car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-starter-in-car.html

-----------

car will turn over but will not start?

http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html

-----------------

Car wont start?

http://howtobyme.blogspot.com/2011/10/car-wont-start.html

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