As time goes by, modern cars are more and more dependent on electronics. There are many sensors and modules, and all they need is wiring and connectors to work properly. That is why electrical problems are on the rise. But, what are the most common car electrical problems, and what is the best way to fix them?
A dead battery will cause most electrical problems. Those include the inability to start the car or problems with other electrical systems in the vehicle. We should not forget problems with blown fuses, and bad wiring and connectors. Other parts of the electrical system, like the alternator and the starter, will also wreak havoc on the electrical system.
To properly understand the electrical issues, you need to know how car electronics work. There are several components that keep the electronic components working without a glitch. Once you know them, you will know where to look. To understand what we are talking about, stay with us until the end of the article.
Symptoms of an Electrical Fault in Cars
Diagnosing and fixing electrical faults can be a drag since you need to have knowledge, tools, and experience with electronics. But, before you get to the diagnosing and fixing, you need to know the symptoms of an electrical fault in the car.
The most common issues that you can freely connect with electrical issues are:
- A car won’t start, or you need to crank it several times. There are a couple of culprits that you should insect if you notice this issue. The usual suspects are a faulty battery, a starter motor, or a problem with a faulty alternator
- Electrical systems like the audio and the power windows are working slowly, badly, or not working at all. An aging battery usually causes this problem. But just like with bad cranking, the issue can be in the starter or with the bad alternator. Other causes for this problem are blown fuses or an issue with the ignition system
- Instead of bright and constant external lights, you are frequently noticing dim lights, that look like they are dying out. If you are experiencing this problem you should first inspect the battery and wiring. A weak battery or damaged wiring will result in lights struggling to work. If these are okay, the inspection should include the alternator and the voltage regulator.
- You notice a burning smell inside the car cabin. A burning smell can be the result of a leak of oil and fuel, but also burnt wire casing or insulation. This can cause a short circuit resulting in severe electrical issues. There are noted cases when this type of problem sets the car in flames. If you notice a burning smell inside the car, stop the car as soon as possible, and turn off the engine. Call a towing truck to transport the car to your mechanic
- You are constantly replacing blown fuses. The fuse’s primary function is to protect the electrical circuits by breaking the circuit if the flow of current becomes too high. If you find yourself changing the same fuses all over, the problem can be in the electrical components that are connected to the fuse. The problem can be in the faulty wiring or connectors.
What Are The Common Causes of Electrical Problems in Cars?
Battery Issues
The most important function of the battery is to supply the ignition system with power, so the engine can start. The battery also stores power converted by the alternator. An old, not full, or completely dead car battery will put a car at a complete stop.
The battery supplies the electrical system with 13.5 to 14 volts. If the volt output drops, then you will first notice symptoms like difficulties with starting the car. Also, problems with most of the electrical systems will arise. If the battery is dead, with a readout lower than 10 volts, the ignition system won’t work and you will not be able to start the car. All other systems will also come to a complete halt.
Alternator
The alternator together with the battery and the voltage regulator is responsible for the charging of the electrical system. The alternator provides a constant supply of electricity to the battery where it is stored. The alternator takes mechanical power from the drive belt and converts it into electrical power.
If the battery is empty, or there are issues with the rest of the electrical components, the cause for it can be a bad alternator. If the alternator is not supplying the battery with much-needed electricity, the battery will drain. So, when the alternator is not delivering power to the battery, you will be only able to look at your parked car.
Fuses
Fuses protect electrical components and wiring from excessive current power. When too much current flows through it, the fuse will melt, stopping the high current from destroying the electrical circuit.
If the car is having constant problems with blown fuses that means that there is a short circuit or an overload somewhere in the system.
Ignition System
Once you crank the ignition key, the ignition system generates a high-voltage current from the battery. That voltage goes to the spark plugs resulting in the combustion process which starts and moves the car. If you cannot even start the car, and you can only hear the clicking sound then the problem could be in the battery or the ignition system.
Headlights
If the lights are not receiving enough power, you will first notice it with the headlights. They will first go dim and flickering, and if the problem progresses they will not work at all. All the lights in the car are supplied by the battery. If the battery is damaged, or it doesn’t receive electricity, the lights will stop working properly.
Bad Car Wiring
Wires and connectors are responsible for transferring and delivering current from the power source to the components. Wiring is often exposed to heat, sometimes a fluid leak, and dirt and debris. They are prone to damage, and the same goes for the electrical connectors. They can get corroded and loose, causing different problems. Bad wiring and loose connectors will create several issues that will make driving a car very difficult.
Signs of Bad Wiring in Car
Bad or loose wiring can result in different problems. This can be tedious to diagnose because the symptoms are similar to symptoms that other problematic components make.
- Dim or flickering lights
- Frequently blowing fuses
- Problems with starting the car
- The smell of burned plastic
If indeed the symptom is the wiring, then the wiring is either damaged or lost. That can create a short circuit or a bad ground.
Check Out Car Electrical Problems: What Causes This Trouble?:
Step-by-Step Guide on How To Diagnose Electrical Problems In A Car
When diagnosing electrical problems, you should start by checking the most obvious sources of problems. Then if they are not the issue, move to less problematic elements of the electronic system.
- Inspect the car with the OBD-II scanner. Connect it to the car’s ECU, so you can start the testing. Look for any error codes connected with the electric malfunction. Any codes that indicate a problem with a sensor or a module may be the culprit for the issues you are having with the power supply. If you find any error codes, check if they could in any way impact the electrical supply.
- Inspect the battery. First, check its terminals and cables. The cables should be properly insulated and without any sign of damage. When the battery terminals are corroded or sulfated that is the result of battery acid coming in contact with the terminals. Regular corrosion comes in white, brown, or blue and green color combinations. The corrosion can be removed with a battery terminal cleaner. In case of sulfation, the terminals will be covered with a gray substance buildup. A sulfate problem indicates that the battery is often half full, which is a problem. Corrosion can be fixed, while sulfation demands buying a new battery.
- Test the alternator. The alternator is located in the front of the engine and is powered by the serpentine belt. For the test, you will need a multimeter. Set the multimeter to measure DC above 15 volts. Clean both terminals on the alternator. Connect the black cable from the multimeter to the negative terminal on the alternator. Also, connect the red multimeter cable to the positive terminal on the alternator. The ideal alternator readout is 12.6 volts. Turn on the engine and again check the readout on the multimeter. An optimum readout is between 14.2 and 14.7 volts. If the multimeter shows over 14.7 volts, then the battery is overcharged. If it shows below 14.2, then the alternator is not recharging the battery properly. Turn on the lights and other electronics in the car. The readout should not go below 13 volts. Turn off the engine, and the readout should not show below 12.6 volts value again. If the readout is a bit lower, that means that the battery is not full. If the multimeter shows below 10 volts, that means that the battery is dead. That means that you are dealing with a malfunctioning alternator.
- Inspect and test the wiring and connectors. The first part of the test is to do a visual check of the wiring. Wiggle the wiring and the connectors to check for any loose connections. Loose wires and connectors will lead to problems in the electrical supply of the components. Also, check the cables for corrosion. If you don’t find any obvious culprits you can check the individual sensors and modules with a multimeter. To do so disconnect a suspicious sensor. Turn the ignition key but don’t turn on the engine. With a black multimeter lead find a contact with a good ground source. With a red lead probe the connector terminals. If there is a voltage readout then everything is okay. If there is no readout, maybe the connectors are not working, or there is a problem with a fuse.
- Test the ignition coil. A coil is a spiral of wire which creates a magnetic field. The magnetic field then creates a spark that helps combust the air and fuel mixture to move the car. If the ignition coil is faulty, you won’t be able to start the car. If you detected an OBD-II code that points to a problem with a coil, you should test it with a multimeter. Disconnect the negative battery terminal. Set the multimeter to measure resistance (ohms). Connect the negative and positive multimeter pins on the negative and positive coil terminal of the coil pack. The multimeter should show a readout of 0.5 to 2 ohms. If it is not, then the reason for your electrical glitch is a faulty ignition coil.
- Check the fuse box. Most cars have two fuse boxes – one under the hood and the other on the driver’s side of the cabin, behind the plastic covers. Before proceeding check the manual for the car. In there you will find the location of every electrical fuse, and what is its purpose. If the same fuses are causing issues, you should first check them first. Again, you will need the multimeter. Set the multimeter to measure direct current (DC). Place the black probe in the safe ground source. With a red probe check both sides of the fuse. If they are showing 12 volts everything is good. You can also visually check the fuse. First, remove the fuse with a needle-nose pliers. Then move a fuse near the light source and check if the metal wire inside the fuse is in one piece. If it is broken, then it should be replaced. If you inspected all the fuses and concluded that the fuse box is the issue, you will need to replace a whole faulty fuse box.
Check Out Checking Car Wiring Circuits For Continuity with a MultiMeter:
Fixing Electrical Problems In A Car: DIY vs Professional
Fixing electrical problems requires some experience with electrical tools and equipment. If you fixed electrical components around the house, you could try to diagnose and fix electrical issues in the car. The only downside is that you need to know the location of all electrical components. Before you start get the instruction manual.
You will also need some special diagnostic and testing tools, like a multimeter and an OBD-II scanner. Besides that, you also should gather basic hand tools. Those include different wrenches, screwdrivers, and pliers. You can never know what you will need to take apart to get to the issue. Also, use safety goggles and gloves when needed.
If you are having a hard time finding a problem, or even tackling this issue, it is completely fine to contact a professional. They know where to start, and what are the most common problems that can cause the issues you are experiencing. You will have an extra cost of labor, but it can save you a lot of money in the long term.
Properly fixing the glitch is the only thing that matters. If you can do it yourself, you will save a couple hundred dollars. If not, leave the job to the pros. The worst thing is to leave the problem unsolved. Usually, problems pile up with time, and you will end up with a serious issue, that you will need to splash out some serious amount of money to fix.
Cost of Fixing Car Electrical Problems
The prices vary depending on the type of vehicle and the manufacturer of the part. There are cheaper options, usually made in China. They are sometimes okay, but in other situations are just a waste of money.
- A new battery: $50-$250
- A cars alternator: $600-$800
- A new serpentine belt: $80-$150
- A replacement starter motor: $70-$425
- A new starter solenoid: $25-$150
- A new fuse box: $100-$150
- A new ignition coil: $200-$300 per coil
- Wiring replacement: $1,400-$2,100.
These prices include both the cost of the part and the labor.
FAQs
How Long Does It Take To Fix Electrical Problems in a Car?
Fixing an electrical problem depends on the issue. If the issue is easy to spot, like a damaged battery, it can be resolved in a matter of minutes. Checking the fuse box, and all the fuses can also be done relatively quickly.
The starter and the alternator can eat some more time but still are not major time consumers. The issue that can take a longer time to fix is if there is a problem with the ignition coil. Maybe the most difficult and time-consuming task is to diagnose and fix the wiring problem.
In every case, if the problem is ordinary, fixing it can last between half an hour and a couple of hours. One labor day should be enough for all electrical issues.
Will Jumpstarting a Car Cause Electrical Problems?
Not properly jumpstarting the car can cause extensive damage to different electrical systems. When you attempt to jumpstart the battery, you are making a surge that can go up to 20 volts. an ordinary acid battery can handle up to 16 volts, so a 20-volt surge can make your battery feel like it was hit with a thunderbolt.
Most of the modules and sensors in modern vehicles can also handle up to 16 volts, so a sudden surge of higher voltage can permanently fry them. This is especially the case for modern post-2000 vehicles that employ many electrical components to work.
Final Considerations
Modern cars use so many different electrical components which can cause different potential issues. These issues are usually serious and can keep you from starting your car. Thankfully, a mechanic with a lot of electrical experience under his belt can resolve these issues quickly.
The most common cause for this problem is a bad battery, starter, or alternator. Usually, these problems won’t make you take a loan, so you should resolve them as soon as possible. In some drastic cases, it can cost you a bit more, but it is nothing when compared to other vehicle issues that you can experience.
Either way, do not attempt to drive a car with electrical issues because they can in the long run develop serious consequences.
