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electrical system

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Symptoms of a Bad or Failing Fuse
If your car's accessories are shutting off on their own or you find a black fuse, you should inspect the car's fuses and replace broken ones.
How to Clean Battery Connections
Cleaning your battery connections, especially if the terminals are corroded, will help ensure the battery lasts longer and performs well.
How to Inspect Car Fuses
A fuse is a low-resistance resistor device that protects a circuit from becoming overloaded. It is a short piece of wire that is designed to melt...
Symptoms of a Bad or Failing Fuel Pump Relay
If the engine is stalling or not starting, or the fuel pump is not making any noise when the key is on, you may need to replace the fuel pump relay.
How to Replace an Automatic Shutdown Relay
The ASD (Automatic Shutdown) relay is failing when electrical functions in the vehicle are inoperative or when the car will not start.
Symptoms of a Bad or Failing Starter Relay
Common signs include the vehicle not starting, starter staying on after the engine started, intermittent issues starting, and a clicking sound.
Symptoms of a Bad or Failing Tail Light Lens
A cracked tail light lens will progressively get worse until the tail lights won't work, so make sure to routinely check them before they fail.
How Long Does a Fuse Last?
The electrical system that is on a car plays a large role in ensuring that everything is running efficiently. There are a number of different things in a car that will require a...
Symptoms of a Bad or Failing Electronic Spark Control
Common signs include engine performance issues, engine stalling, the car not starting, and the engine not sparking.
How Long Does an Electronic Spark Control Last?
The job of the electronic spark control is to control the engine timing. This part can also be called the "knock sensor", as it monitors any unusual knocking, or vibration that...
Symptoms of a Bad or Failing Electronic Ignition Pickup
If your car has an electronic distributor ignition system and the engine stalls or car does not start, you may have to replace the ignition pickup.
How Long Does an Electronic Ignition Pickup Last?
Your vehicle depends on electricity in order to run, and this electricity can be traced back to the spark plugs which create a spark to ignite the fuel. It’s a whole...
Symptoms of a Bad or Failing Electronic Control Relay
If your engine cranks but does not start or powers on but does not function, you may need to replace the electronic control relay.
How Long Does an Electronic Control Relay Last?
So much of your vehicle relies on electronic components nowadays. They all work in conjunction with one another, so that means when one fails a domino effect takes place, and they...
How Long Does an Ignition Coil Last?
The combustion process that happens when your car is cranked is vital in order to get the car moving. In order for this process to take place, a number of different components...
How to Replace an AC Control Module
AC control modules fail when the air does not distribute fully. If the temperature is inconsistent, the control unit may be at fault.
How to Replace an Electronic Control Relay
Electronic control relays are tied to many components in your car. When an electronic part doesn't work in your car you may need to replace a relay.
How Bad Driving Prematurely Wears Out Your Car
Bad drivers and bad driving habits can cause strain on car parts, especially the tires, brakes, body, and electrical and steering systems.
How to Replace an Instrument Voltage Regulator
The instrument cluster has a voltage regulator that fails when the panel is dim or flickering, reads erratically, or is totally inoperable.

Related questions

Question
2003 Mercedes C240 will not start
At 210 thousand miles, it really could be just about anything. If the alternator wasn't charging and you drove the car until the battery voltage went so low that it cut off, there are probably a zillion codes stored in...
Question
Safe Mode is active on my truck.
Hi there. Your vehicle should have an AODE or 4R70W transmission. In this transmission, in the event there is a power loss to the transmission or if the computer shuts off the power to the transmission, the default gear is...
Question
Connector not connected anywhere.
Hi there. The wiring harness could be for an accessory on the exhaust or cooling system that your vehicle is not equipped for. Check all of the sensors and the cooling fans and make sure that everything is plugged in....
Question
I changed the battery and now my windows go up and down by themselves and I have a clicking noise from the door
Hello, thank you for writing in. When these types of electrical issue occur after changing the battery, there may be several things you have to try to rectify the issue. One would be making sure the battery is hooked up...
Question
My brake lights are not working, fuses are good
It is possible both bulbs are burned out. The filament in each bulb should be tested with an ohmmeter. The bulbs can also be powered off the car to see if both filaments work but be wary of short circuits...
Question
my daughter has a 2004 Toyota Highlander. the car wont start so i think it's the fuel pump since i can't hear it run. so once i ge
Check the fuse. There could be more than one relay in the circuit, for example a circuit opening relay as well as an EFI relay. The fault could be due to high resistance in the circuit (even at the relay...
Question
My trunk won't open with the control inside the car but WILL open with the button in my key.
Since the mechanism that releases the trunk does function when you use the transmitter, it is likely the button inside the vehicle is faulted. There could be a loose connection or the switch itself may be malfunctioning. Consider hiring an...
Question
I alway have o jmp my truck after four days, I bought a new battery and after a few month it starte doing the ame hin again, what
If the battery is new and charging system output has been measured and is within Factory Service Manual specifications, the only reason a battery will discharge is if the car sits for a long period of time (batteries self-discharge, but...
Question
Cannot drive past 20 mph Chevy silverado
Hello, thank you for writing in. It would appear that the mechanics (engine slowing and braking issues) are being effected by the electronic sensors and modules that control them. When you have several systems failing at once, you want to...
Question
My brake lights not working I changed the switch
It is possible both bulbs are burned out. The filament in each bulb should be tested with an ohmmeter. The bulbs can also be powered off the car to see if both filaments work but be wary of short circuits...
Question
My parking brake light comes on dimly when I shift into 4WD.
The main functions of the parking brake lamp are for the brake fluid level in the master cylinder as well as the parking brake switch, so there may be a shorted circuit either in the instrument panel where the brake...
Question
Number 4 fuse keeps blowing.
A little further diagnosis will be required to find out what component along the circuit powered by this fuse keep blowing it and causing the other issues. Things like a component with an internal short or corrosion causing a shorted...
Question
I have a burning smell in my car.
This is not likely. A dirty cabin filter filled with old pine needles is more likely to cause a moldy smell inside the vehicle. The burning smell may be coming from a a shorted circuit somewhere in the car. Consider...
Question
2006 kia spectra, temperature gauge not working
With regard to the temperature gauge, the fault there could be due to the sending unit (which is the temperature sensor), the receiving unit (the dash gauge), the fuse or the circuit wiring. To resolve an issue such as that,...
Question
99 Niss.Max, brake,battery,check engine light on, car died while driving, replac. batt, started and drove and next day won't start
You may have a faulty charging system and/or intermittent electrical connections. At this point, be sure that you have a fully, 100% charged battery that passes a load test. Confirm that the engine immobilizer system (security system) is not activated...
Question
i change my engine to a newer year do i have to chang sensor also
If you are using your old vehicle wiring harness, you can use your old oxygen sensors. However, note that the plug ends of the sensors used on the 2012 Travese are different than those used on the 2009 model year...
Question
Car starting sometimes, sometimes have to jump, speedometer and tach working but all other gauges not working 2003 GMC Yukon
Hi there - check fuses first, but it sounds like you might have a problem with your digital dash, and possibly a wiring issue that is draining your battery overnight. The lack of gauge function is is a high failure...
Question
Windshield wipers stopped working. They'll suddenly stop working then suddenly start working again. Has been happening for a week.
The problem you are describing likely stems from an intermittent electrical fault in the wiper circuit. The windshield wiper system uses a small electric motor to move the wiper arms that you see on the windshield. That electric motor is...
Question
Courtesy light fuse drains battery 2000 Chevrolet Silverado
Hi there - great diagnostic work! At this point, having identified which circuit is causing the drain, you will need a wiring diagram that identifies what other devices are on this circuit (clock, underhood light maybe?), and could be drawing...
Question
2016 jeep compass fog lights dont come it shows on dash that they are but the lights are not
Hello, thank you for writing in. There are a few things you can do to track down the issue. Start with checking the fuse. It should be located in the main fuse box under the hood, and the diagram on...

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