Can I Repair My Alternator

Many people assume that the car's battery is the merely affair that powers all electrical components in the car.

But this is not truthful. The alternator plays a vital role in supplying power to the motorcar's Air-conditioning, recharging the battery, and ignition.

When your alternator is faulty, the battery power is drained fast, and you will observe yourself with a stalled car. But what can cause the alternator to go bad and terminate charging the battery?

The most common reason an alternator is not charging the bombardment is due to worn carbon brushes or a damaged alternator itself. Information technology can too be acquired by a blown fuse or bad wirings. If your serpentine belt snapped off, the alternator will, of grade non charge then either.

Now when you know the nigh common reasons, you probably desire to know them in detail also. Hither is a list of the five about common reasons why your alternator is non charging the bombardment.

Causes of Alternator Non Charging

1. Worn out carbon brushes or damaged alternator

The nigh common reason why your car is non charging the battery is actually because of a worn-out or damaged alternator.

You can carefully tap it with a hammer while the car engine is running while checking information technology with a multimeter on the car battery to run into if the voltage is changing.

If the voltage change and become dorsum to normal when y'all tap it lightly with a hammer while the machine is running – the Carbon brushes are worn out and needs to be replaced in the alternator, or the whole alternator.

Sometimes there is an electrical problem in the alternator, and even if the voltage does non change, it might be damaged.

Another common cause is a bad diode plate or a voltage regulator. Yous might need some cognition about alternators to supervene upon these in most cases.

Information technology was more common to replace parts inside the alternator like the carbon brushes, diode plate, or voltage regulator on older cars. Nowadays, alternators are quite cheap, and mostly information technology is more worth replacing the whole alternator.

If you have already replaced it with a brand new alternator, but it's still not charging the battery, you should keep reading in this list.

2. Broken Serpentine belt

A closer observation of the alternator will reveal a pulley and belt arrangement that works to convert mechanical free energy into electrical energy.

The serpentine belt powers the alternator, and if it fails, the alternator will stop working the moment your chugalug wears out and breaks, or the pulley becomes damaged.

This tin besides happen if the serpentine chugalug is not tightened correctly. Most cars have automatic tensioners, merely these can fail, so it is ameliorate to double-check.

Some older cars have transmission tensioners, and in this case, you might have to tighten the serpentine chugalug.

The serpentine chugalug and pulleys are often pretty easy and cheap to supplant.

iii. Faulty fuse

There is often a huge fuse connected to the alternator's big power cable. It is ofttimes an 80A fuse or more and is near oft constitute in your car's fuse box in the engine bay.

Fuses blow upward due to a power surge, or they wear out. When this happens, the current will stop flowing from the alternator. The solution is to check your car's transmission for the item fuse that controls the alternator and replace it.

In some cars, you lot might likewise find some other pocket-size fuse to the alternator'southward control—ordinarily a 15A to 20A fuse.

iv. Wiring bug or connectors

An alternator does normally has 3 or 4 wires to information technology to function properly. You will observe one big master cable together with two or three minor ones.

All these wires are important for the alternator's function, and if one breaks off – you might lose the charging function.

Check the big ability cablevision connectors between the alternator and the car battery to ensure there is no corrosion there. You tin can usually find that the cable will get warm if there is a bad connectedness somewhere.

Check or measure these wires with a multimeter. Remember that measuring them is non e'er correct considering y'all have to load test wires that are half cleaved or have a bad connexion.

Yous should usually have 12 volts on one of these wires, and the other one goes to the battery light on the dashboard. If you have a 3rd one, information technology does often go to the engine control unit. To measure this properly, you need a wiring diagram of your specific car model.

5. Damaged motorcar bombardment

The alternator and the car's bombardment work hand in hand. A actually bad car bombardment might actually not take care of the accuse from the alternator, which volition cause the alternator non to charge at all.

In theory a car tin run just with the alternator charge, but this tin cause heavy voltage spikes and other strange symptoms and then this ways that a bad car battery can cause an alternator to not charge also.

6. Engine command module mistake

Cars are increasingly coming with mod electronics. In this regard, the engine command unit (ECU) controls most of the machine'south electric components.

Modern cars also command the alternator. In some rare cases, there might be a problem with the engine control module not controlling the alternator's charging.

Check for any problem codes with an OBD2 scanner to determine if anything is whatever other damaged role that prevents information technology from charging.

In some rare cases, at that place might actually be a faulty engine command unit. Only e'er check all other possible causes showtime.

Diagnosing an alternator that won't charge

There are some like shooting fish in a barrel steps you can go through to check the function of your alternator.

Tap the alternator carefully with a hammer while the engine is running; if the charging goes back to normal, the carbon brushes within information technology are worn out and need a replacement.
Cheque the large ability cable to the alternator and the fuse, usually, a large 40-60 amp fuse almost the bombardment.
Check the footing cable betwixt the engine and the body.
Bank check the serpentine belt and make sure the alternator is spinning with the engine.
Check the small power supply wire and the charging calorie-free wire. You tin measure it with a multimeter, but yous might need a wiring diagram and some automobile electronic skills to practise this correctly.
You can measure the diode assembly and the voltage regulator to brand sure they are non damaged. You can supplant these with some alternators, but it is often the same price to buy a new alternator nowadays. It is upward to you what you think is more than worth it.