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Why did my 12 volt power outlet stop working?

If your 12V power outlet, also known as a cigarette lighter socket, has stopped working, there could be a few potential reasons. The most common causes include a blown fuse, a wiring issue, or a problem with the outlet itself. Let's explore these possibilities in more detail.


Blown Fuse


One of the most common reasons for a 12V power outlet to stop working is a blown fuse. The outlet is typically connected to a fuse in your vehicle's fuse box, which is designed to protect the electrical system from overloads or short circuits. If the fuse has blown, it will need to be replaced. Check your vehicle's owner's manual or the fuse box itself to locate the correct fuse and replace it with one of the same amperage rating.


Wiring Issues


Another possible cause of a non-functioning 12V power outlet is a wiring problem. The outlet is connected to the vehicle's electrical system through a series of wires, and if any of these wires become damaged, loose, or corroded, it can prevent the outlet from receiving power. Inspect the wiring leading to the outlet for any signs of damage or wear, and have a mechanic or electrician check the connections if necessary.


Outlet Failure


In some cases, the power outlet itself may be the source of the problem. Over time, the internal components of the outlet can wear out or become damaged, preventing it from functioning properly. If the fuse and wiring checks out, the outlet may need to be replaced by a mechanic or auto parts store.


Additional Troubleshooting Tips



  • Check if the outlet is receiving power by testing it with a multimeter or by plugging in a known working device.

  • Ensure that the outlet is not being overloaded by devices that draw too much current.

  • Consider the age of your vehicle - older cars may have outdated or less reliable electrical systems.


If you've tried these troubleshooting steps and the 12V power outlet still isn't working, it's best to have a professional mechanic or electrician diagnose and repair the issue to ensure the safety and proper functioning of your vehicle's electrical system.

Why would a socket suddenly stop working?


Common causes when a wall socket stops working include: Failed internal socket connections, which is common in older outlets that no longer snugly hold plugs. A tripped circuit breaker that cuts power to the wall socket. Loose connections within the circuit breaker box.



How do I know if my 12 volt fuse is blown?


The better way to find out if your fuse is completely blown as to use a Multimeter. All you have to do is set the multimeter in continuity mode. And connect the probes to the ends of the fuse.



How do you test a 12 volt outlet?


The easiest is to simply plug in the cigarette lighter if you have it. If the lighter heats up and pops out, then the socket has power. You can also use a test light to check for power, if you have one, or examine the fuse panel to see if the cigarette lighter fuse is blown.



Why would an outlet suddenly not have power?


You might be overloading that particular circuit with too many appliances or devices working at the same time. Or, there could be a problem with your wiring or circuit breaker itself. If your outlet is not working, but the breaker is not tripped either, there might be an issue with your circuit breaker.



Does a 12V plug have a fuse?


It isn't 'unsafe' because the 12v supply is fused with a 10a fuse which will blow if significantly more than 10A (120 watts) is pulled from the supply, thus protecting and 'safeing' the system. The fuse is there to protect the cabling and associated electrical connections from excess current draw.



Why is there no power to my cigarette lighter socket?


  • Blown Fuse: The most common issue is a blown fuse.
  • Faulty Lighter Element: The heating element inside the lighter may have burned out or become damaged.
  • Connection Issues: Loose or corroded connections in the lighter socket can lead to poor electrical contact, causing the lighter to fail.



How do I get my cigarette lighter to work again?


Check the Fuse: Locate your car's fuse box (often found under the dashboard) and identify the fuse linked to the cigarette lighter. Remove and inspect the fuse. If it's blown, replace it with one of the same amperage. Test the Socket: Use a multimeter to check for voltage at the socket.



How do you change a fuse in a 12v plug?


So put the 10 amp fuse. In there the cap this small little piece here sits on top of the fuse like that. And then we're going to screw that one back into. Place. It's finger tight it's fine.



Why is my 12V DC outlet not working?


A 12-volt outlet may stop working due to a blown-out fuse, damaged wiring in the outlet, the outlet itself malfunctioning, or an alternator problem. A damaged or malfunctioning 12-volt outlet needs replacement as soon as possible to ensure there is a reliable way to power electronic devices while driving on the road.



Why is there no power coming from my socket?


There could be an issue with the wiring behind the plug socket or there could be loose or burnt connections behind. There could also be nothing wrong at the socket but another socket on the circuit may have loose connections behind it! In any event, this is best left to an electrician to come and sort out for you.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.