When something goes wrong within your car’s electrical system, your car won’t run or may not even start. Learn how to diagnose electrical problems with our guide below.
How To Diagnose Electrical Problems In A Car
It’s very important to address any electrical problems as soon as possible to ensure the safety of everyone in your vehicle and on the road. Below, we have detailed eight of the most likely culprits behind electrical issues.
1. Dead Battery
Sometimes, when a car battery dies, it is possible to still get some power to the car. However, if the battery is completely dead, you will not be able to turn on anything.
The majority of car batteries will last anywhere from three to five years. If the battery fails before that time, there could be another factor behind the failure.
It is possible for batteries to drain for other reasons like leaving the lights or stereo running. In these cases, you can jump-start the battery back to life.
Common Symptoms Of A Dead Battery:
- Dim interior lights.
- Engine will not turn over immediately.
- Car stalls.
- Warning light illuminates while driving.
2. Bad Spark Plugs
The majority of vehicles will feature one spark plug for each cylinder in the engine. These plugs provide your vehicle with the needed power to operate.
This will happen when the plugs convert electric energy into a spark, igniting the fuel and ultimately powering the engine. They will kick-start a chain reaction that powers the vehicle. When the plugs fail to work properly, a serious of issues may arise.
Common Symptoms Of Bad Spark Plugs:
- The check engine light either flashes or stays on.
- Decreased gas mileage.
- Power both surges and drops.
- Overall engine trouble.
3. Malfunctioning Ignition Coils
Most vehicles will have one per cylinder ignition coils. It’s the job of the coils to provide the electricity to the spark plugs.
If these coils malfunction, it will affect the spark plugs, while also increasing the risk of costly damage to the catalytic converter.
Common Symptoms Of Malfunctioning Ignition Coils:
- Car will not start.
- Reduced gas mileage.
- Check engine light illuminates.
- Overall engine trouble.
4. Faulty Fuse Box
Fuses are responsible for protecting the car’s electrical system by melting if too much electricity is flowing through them. Thankfully, replacing a blown fuse is relatively inexpensive compared to other car issues.
For persistent electrical problems, drivers may need to replace the whole fuse box. Most cars will feature two boxes, one beneath the hood and one on the driver’s side of the cabin.
Common Symptoms Of A Faulty Fuse Box:
- Loose fuses.
- Water stains on the fuse box.
- Bare or broken wires.
- Frequently failing fuses.
5. Issues With The Wiring
Just like other electrical systems, a car will rely on many wires to get electricity where it needs to go. When something seems off, it can be quite difficult to locate the issue.
Once you find the problem area, you must replace any damaged or broken wires. On average, replacing all car wiring can cost up to $2,000.
Common Symptoms Of Bad Wiring:
- Frequently blowing fuses.
- Occasional power loss or flickering lights.
- Trouble starting the car.
- Burning plastic smells.
6. Failing Engine Control Module
This is the computer responsible for controlling the car’s engine. Without this, the engine will not start up.
Sometimes, this is referred to as the engine control unit or even the powertrain control module. It is an essential component of modern vehicles.
Common Symptoms Of A Failing Engine Control Module:
- Car refuses to start.
- Check engine light illuminates.
- Frequent stalling.
7. Faulty Alternator
Your car’s alternator is responsible for charging the battery while your engine is running. If it ultimately fails, the battery loses its power, and you will not be able to start the car or power any of its features.
The majority of drivers do not realize that the alternator is failing until they charge the battery, and the issues arise once again. You may replace the battery only to discover later that it was the alternator creating the problems.
Common Symptoms Of A Faulty Alternator:
- Vehicle stalls.
- Power warning lights are on while driving.
- Electrical components lose power.
- Smell of burnt rubber.
- Grinding noises when changing speeds.
8. Starter Won’t Work
The starter helps get the engine running when the key is turned. If the starter fails, your car will not start up. Plus, without the car running, some parts may not have any power.
However, if you can turn on the ignition, there should be a few features you can run. With a charged battery, you should be able to turn on the headlights and the stereo.
Common Symptoms Of A Bad Starter:
- Clicking or whirring noise when turning the key.
- Engine will not turn over.
Conclusion
It’s no secret electrical problems can stop a car in its tracks. Since any electrical issue can impede your car’s performance and safety, it’s crucial address these as soon as they are noticed. See the team at Heath’s Auto Service for any electrical repairs.
Heath’s Auto Service In Scottsdale, AZ
At Heath’s Auto Service, we offer a comprehensive range of services and repairs to meet all your automotive needs. From routine maintenance like oil changes and tire rotations to more complex repairs involving brake systems, engine diagnostics, and transmission issues, our highly skilled technicians are equipped with the latest tools and technology to ensure your vehicle is serviced to the highest standards. Contact our team today!
