Alternator Problem Diagnosis

Electricity plays a major role in the working of most machines today, including automobiles. In fact, most modern cars have a mini computer fitted in, which controls most of its basic functions. With AC systems fitted in and even TV, media players and stereos in there, modern cars like limousines are nothing short of moving luxury hotel suites. One wonders how these cars manage to be self-sufficient in terms of electric power, to run all these devices. It is all possible because of the alternator. Cars are fitted with generators that provide them with the necessary power to move ahead. These dynamos called alternators (alternating current generators), use the mechanical torque generated by car engines to generate electricity.

Your car battery is like a reservoir of electricity, which is constantly replenished by this generator device, when the car is moving. All electrical systems draw energy from the battery's reservoir and if the alternator is not doing its job, the reservoir may dry up, leaving you stranded somewhere while driving.

Bad Alternator Symptoms

If you notice any of these signs, then you need to get your alternator checked as soon as possible.

Dashboard Light
There is a warning mechanism for problematic alternators, in the form of an indicator on the dashboard, that you can easily notice. When the light glows, it means that the alternator's expected voltage output has dropped below normal levels and therefore it needs to be checked.

Low Battery Output
Another indirect indicator is low battery output. If you notice that the battery output voltage has dropped below normal levels, it means that you have a bad alternator situation. This will be accompanied by diminished performance of electrical accessories, including the headlights.

Diagnosing Alternator Problems

You need to arm yourself with a digital multimeter used for voltage measurements. Before you check up the alternator, make sure that your car battery is performing well. Often, it is the battery is the real culprit, rather than the alternator.

Check Battery Output Voltage
Here is a simple testing procedure. Start up the car and keep it idling. Armed with your digital multimeter, access the car battery and connect its test probes with positive and negative of the car battery. Set the dial to measure voltage settings and observe the readings. When the car's idling, the voltage output should be above 14 V. If it's below 13 volts when engine's idling, with most electrical accessories shut off, then you can be sure it's a problem with the alternator. It may be due to a problem with the belt or rotor.

Observe Alternator Belt Condition
Check out the belt's condition. If it's worn out and close to breaking point or loose, the device is not receiving torque from the engine, in totality. Tighten it or replace the belt if it is beyond repair.

Rotor Check Up
Check if the rotor, which is driven by the belt is working properly. Also check the wiring with reference to the circuit diagram supplied in the car manual. If there is a problem with the rotor, it is best to go for a replacement.

When you consistently follow a car maintenance schedule, any problems waiting to arise will be stopped right there in their tracks and a major breakdown, will be prevented. If you are not sure of what to do, let a trained car mechanic handle the job for you.