Introduction
When it comes to cars, batteries get a lot of attention, but alternators are just as important. Alternators are responsible for converting the mechanical energy from the engine into electrical energy to power various systems in your car. An alternator failure could leave you stranded on the side of the road, or worse, in the middle of a busy highway. This article will explain how to tell if your alternator is bad, how to test it, and solutions for fixing the problem.
Symptoms of a Bad Alternator
The first step in diagnosing a bad alternator is understanding the symptoms. Here are the most common signs of a failing alternator:
Slow Cranking
A telltale sign of an alternator problem is a slow-cranking engine. When the alternator is not functioning correctly, the battery can’t get charged, and as a result, it may not have enough power to turn the engine over.
Dim Lights
Dimming lights are another indicator of a weak battery and could be due to a faulty alternator. The alternator’s primary job is to power the electrical systems in your car, including the lights. When an alternator is bad, the lights will start to dim, indicating that there isn’t enough energy in the system.
Check Engine Light
If the check engine light comes on, it’s often because of issues with the alternator or other charging system components. This light can signal a range of problems, but it’s worth checking with a mechanic to rule out an alternator issue.
Other Warning Signs
Other signs of a problem with your alternator could include battery warning light, electrical issues, burning smells, belt noises, and engine stalls.
Testing the Alternator
If you’re experiencing some of the above symptoms, you may need to test the alternator. Here are some methods:
Using a Multimeter
A multimeter is a relatively inexpensive tool that you can use to test your alternator. Check the voltage of the battery while the engine is off and then when it’s running at idling speed. The voltage should be between 12-12.6 volts when the engine is off, and 13.7-14.7 volts when it’s running. Anything outside of this range could indicate an alternator problem.
Taking the Car to a Mechanic
If you’re not comfortable using a multimeter, taking your car to a mechanic is the best option. A professional mechanic can diagnose the problem and recommend the appropriate solution. These diagnostics tools are what the professionals use and will help to get a much more accurate reading of your alternator function.
Other Methods
Some auto parts stores will let you test your alternator free of charge. Call around to your local stores to see if this service available. Also, some newer cars have onboard diagnostics that can give you alternator performance readings.
Understanding the Alternator
To maintain better care of your alternator, you need to understand it. The alternator is responsible for taking the mechanical energy from the engine and turning it into electrical energy. That electrical energy powers all of the electrical systems in your car, from the lights to the radio and more. Your alternator is also responsible for charging the battery, so if it fails, your battery will soon follow suit.
Regular maintenance is the key to keeping your alternator running smoothly. Regular checks for loose or corroded connections and inspecting the drive belt for signs of wear are critical. If you’re not sure how to perform this maintenance, take your car to a trusted mechanic who can do this preventative work at reasonable prices.
How to Replace the Alternator
If your testing for the alternator indicates that there is an issue, you may need to replace it. Here are the steps:
Steps for Removing a Bad Alternator
First, disconnect the negative terminal on the battery. Then disconnect the electrical connections, including the alternator harness and any grounds. Finally, remove the bolts that attach the alternator to the engine block and remove the alternator toward the front of the engine compartment.
Steps for Installing a New Alternator
If you bought a new alternator, install it in reverse order. Attach the bolts onto the engine block, the connect electrical connections, and then finally reconnect the negative battery cable.
Necessary Tools and Precautions
Changing an alternator doesn’t require anything too fancy, but safety should be your priority. Basic tools such as wrenches and pliers are necessary. Make sure you check the alternator mounting area for damage or corrosion and clear out any debris to ensure a secure new installation.
Preventing Alternator Failure
Ultimately, the best way to deal with a bad alternator is preventing them altogether. Here are some maintenance tips:
Regular Maintenance Tips
The best way to prevent alternator problems is by regularly monitoring it. Check it for signs of wear and tear and maintain its electrical connections. Replace the drive belt and prevent corrosions to keep it going strong.
Avoiding Overloading the Electrical System
Overloading the electrical system with aftermarket parts or heavy-duty appliances is a surefire way to burn out an alternator. Before adding an aftermarket part, be sure to check whether the alternator is rated to handle the additional load.
Dealing with a Dead Battery
If you’re dealing with a dead battery, here are some tips:
How Bad Alternators Can Cause Dead Batteries
If the alternator is bad, the battery won’t receive the charge it needs to power your electrical systems. That means a dead battery. A simple litmus test would be to jump-start the car, but this fix is only temporary.
Advice for Jump-Starting the Car
Firstly, make sure you’re following the instructions correctly. Attach the red clip of the jumper cable to the positive terminal and then attach the black clip of the jumper cable to the negative terminal. In the vehicle with the dead battery, attach the red clip of the jumper cable to the positive terminal. Finally, attach the black clip of the jumper cable to a grounded point on the car.
Advice for Getting the Car to a Safe Location
If you can’t start the car with a jump, you’ll need a tow truck to take you to a mechanic or auto garage. In this case, call a tow truck with a steady hand and a solid track record to get your car to a safe location.
When to Seek Professional Help
While diagnosing and replacing an alternator can be a relatively easy fix, there are situations where it’s best to leave it to the pros. A professional mechanic should help you when:
Circumstances Where It’s Best to Take The Car to a Mechanic
- The alternator requires diagnostic computer testing
- The alternator requires rebuilding or replacing
- You’re not comfortable working on your own car
Do-It-Yourself Warning
This article provides all the necessary information and tips to replace or diagnose an alternator, but working on your own car could lead to bigger mechanical issues if not performed correctly. Hence, do it yourself only if you’re comfortable and confident in your skills.
Conclusion
If you’re experiencing issues with dimming lights, slow cranking, or other warning signs, there’s a good chance your alternator is the culprit. You can test the alternator using a multimeter or taking the car to a mechanic. Replacing a bad alternator is relatively easy, but preventing the failure is the real key to keeping your car’s electrical system in good condition. Remember, regular maintenance is the key. If you’re not comfortable working on your own car, leave the job to the professionals. A bad alternator is too important to ignore, so make sure to keep it in good condition.
