How to Fix Car Charger Not Working
By Robert Jones · 2022-04-03
Stuck with a dead phone on the road? A non-working car charger is a real nuisance, but from my 20 years of experience, it's usually a simple fix. Don't fret, let's get that power flowing again.
Right, so you're on a long drive, maybe heading up the M5 to see some family, or perhaps just popping into town for bits, and your phone battery is looking a bit… well, pathetic. No worries, you think, I'll just plug it into the car charger. But then, nothing. Zilch. Your phone sits there, stubbornly refusing to acknowledge it's even connected. Frustrating, innit? Been there, done that, screamed at the dashboard a few times myself. Over my twenty-odd years tinkering with all sorts of car audio, from basic speaker upgrades to full-blown home cinema setups shoehorned into a camper van (don't ask), I've seen every charging woe under the sun. It's rarely rocket science, more often a case of figuring out what's actually going on. This isn't just about convenience; a dead phone can be a proper pain, especially if you're relying on it for satnav or tunes. Let's get to the bottom of why your car charger's playing silly beggars. ### **Quick Verdict** **Most car charger issues are simple fixes; start with the basics before spending a penny.** ### **Who it's for** * Anyone whose car charger has suddenly stopped working. * Drivers who rely on their phone for navigation or entertainment on the go. * People who want to avoid pricey garage bills for simple electrical glitches. * DIY enthusiasts who aren't afraid to get their hands a bit dirty. ### **Who should skip it** * Those who prefer to pay someone else to handle any and all car issues. * Anyone who thinks electricity is witchcraft. * Drivers whose car charger problems are part of a larger electrical fault in their vehicle (get that to a proper auto electrician, mate).  *How to Fix Car Charger Not Working — tested in the SpeakersMag workshop.* ## **The Usual Suspects: Where to Start Looking** When a car charger packs up, my first thought isn't "Oh no, total electrical meltdown!" It's usually a process of elimination. Think of it like diagnosing a crackle in a speaker – you start at the simplest point and work your way back. Nine times out of ten, it's something daft you've overlooked. Let's run through the common culprits. ### **1. The Charger Itself: Is it Up to Snuff?** Honestly, this is where most problems begin and end. We all grab a cheap charger from the petrol station or a market stall when we're in a pinch, don't we? I've done it. And often, they're about as reliable as a chocolate teapot. * **Is it broken?** Give the charger a good once-over. Any visible damage? Wires fraying? A bent plug? Sometimes it's as simple as that. If you've been yanking it out by the cable or it's had a rough life rolling around under the seat, it might just be knackered. * **Cheap and nasty?** I've seen countless cheap chargers just give up the ghost after a few weeks. They often have poor internal components that can't handle the fluctuating power from a car's electrical system. For something you rely on daily, it's worth splashing out a tenner or two on a decent brand. Anker, Belkin, even some of the better own-brand ones from Halfords or Argos are usually pretty sound. * **Is it even suitable?** Some devices, especially newer smartphones, need a certain amount of power (amperage, usually 2.4A or more) to charge properly, or at all. An old, low-power charger might not cut it. Check your phone's requirements and the charger's output. If the charger is only 1A, and your phone wants 2.4A, it might not show any charging activity, or it might charge so slowly you barely notice it. ### **2. The USB Cable: The Unsung Hero (or Villain)** Oh, the humble USB cable. So often blamed, so often the actual culprit. These things get a proper battering, don't they? Twisted, pulled, folded, jammed in doors. It's a wonder they work at all sometimes. * **Visible damage?** Same as the charger, check the cable for any kinks, cuts, or exposed wires. Pay close attention to the ends where the plug meets the wire – that's where they usually fray. * **Internal breaks:** Even if it looks fine on the outside, a cable can have internal breaks. This is super common. I've had countless customers bring in "faulty" speakers only to find their cheap interconnects were the problem. USB cables are no different. Try a different cable – one you *know* works with another charger or device. That's the quickest way to rule it out. * **Not designed for charging:** Believe it or not, some USB cables are designed primarily for data transfer, not high-power charging. They might have thinner wires that can't handle the current needed to charge your phone effectively. Always opt for a cable specified for charging or one that came with a quality charger. ### **3. The Car's Power Outlet (Cigarette Lighter Socket): More Than Just a Hole** Right, now we're getting into the car itself. The cigarette lighter socket, or 12V auxiliary power outlet as the fancy types call it, is the most common charging point. And it's surprisingly prone to issues. * **Is it getting power?** The simplest way to check this is to plug in something else – another charger you know works, or even an old-school cigarette lighter element if you've got one knocking about. If that doesn't work, you know the problem is with the socket itself, not your charger or cable. * **Debris in the socket:** Over time, these sockets can accumulate all sorts of crud: dust, crumbs, coins, even bits of melted plastic from cheap charger plugs. This can prevent a good electrical connection. Grab a non-conductive tool (like a plastic toothpick or a small wooden skewer) and carefully dig around in there. Make sure the car is OFF before you do this, mind, and definitely don't use anything metal. * **Corrosion:** Especially in older cars, or if you live somewhere damp like Bristol, you might find a bit of corrosion on the inside of the socket. You'll see a rusty or greenish film. You can try to gently scrape it off with a small screwdriver (again, car off!) or a piece of fine sandpaper wrapped around a stick. Sometimes a quick spray of electrical contact cleaner can help, but make sure it's specific for automotive use. * **The fuse:** Ah, the fuse. The bane of many a DIY mechanic. Car power outlets are almost always protected by a fuse. If it blows, the socket goes dead. Finding the fuse box can be a bit of a treasure hunt depending on your car. Check your car's manual – it'll tell you exactly where it is (usually under the dash, in the glovebox, or under the bonnet). Look for a fuse labelled "CIGAR," "AUX POWER," "12V," or similar. They're usually small, coloured plastic things. If the metal wire inside is broken, it's blown. Replace it with a fuse of the *exact same amperage* (e.g., 15A for 15A). Never, ever put a higher-rated fuse in, unless you want to risk frying your car's wiring. They're cheap as chips, about a quid for a packet. I always keep a spare set in the glovebox – saved my bacon more than once. ### **4. The Car's USB Ports: Factory-Fitted Foibles** Many modern cars now come with built-in USB ports. While convenient, they can have their own issues. * **Low power output:** A common complaint. Many factory USB ports are designed primarily for data transfer to the infotainment system (for Apple CarPlay or Android Auto, for instance) and offer very low power output (often 0.5A). This is barely enough to maintain your phone's charge, let alone charge it quickly while you're using navigation or streaming music. If your phone isn't charging, or is charging incredibly slowly, this is likely the reason. You're better off with a dedicated car charger in the 12V socket. * **Software glitches:** Sometimes the infotainment system itself can get a bit confused. Try turning the car off and on again, or consult your car's manual for how to reset the infotainment system. It's a long shot, but sometimes it works. * **Damaged port:** Just like any other USB port, these can get damaged from repeated plugging and unplugging, or from having things jabbed into them. Check for bent pins or debris. ## **Advanced Troubleshooting (When the Basics Don't Cut It)** If you've gone through all the above and still no joy, it's time to dig a little deeper. This is where a multimeter can be your best friend, though you can often get by with a bit of common sense and a test light if you're careful. ### **1. Testing Voltage at the 12V Socket** * **With a multimeter:** Set your multimeter to measure DC voltage (usually marked with a V and a straight line with three dots below it). Put the red probe into the centre of the 12V socket and the black probe onto the outer metal ring. With the ignition on, you should see something around 12-14V. If it's zero, or significantly lower, you've got a power delivery problem to the socket itself. This could be a wiring issue between the fuse box and the socket, which is a job for an auto electrician unless you're very comfortable tracing wires. * **With a test light:** These are simpler, cheaper, and often quicker for a basic check. Clip the crocodile clip to a good ground point (any unpainted metal in the car's chassis). Touch the probe to the centre pin of the 12V socket (with the ignition on). If the light illuminates, you've got power. If not, power isn't reaching the socket. ### **2. Checking the Car Battery and Alternator** While less common for *just* the charger to fail, a weak car battery or a struggling alternator can lead to all sorts of electrical gremlins, including inconsistent power to accessories. * **Dim lights? Slow crank?** If your headlights seem dim, or the engine struggles to turn over when starting, your battery might be on its way out. A tired battery might not be able to supply consistent voltage, especially when other systems are drawing power. Get it tested at a local garage or Halfords – they usually do it for free. * **Alternator issues:** The alternator charges your battery while the engine is running. If it's faulty, your battery won't get charged, and electrical accessories will suffer. You might see a battery warning light on your dash. This is definitely a job for a professional. ### **3. Phone/Device-Specific Issues** Sometimes, the car and charger are fine, but your *device* is the problem. * **Charging port damage:** Check your phone's charging port for lint, dust, or bent pins. Use a plastic toothpick or compressed air to clean it out *gently*. A bent pin inside the phone's port can prevent charging entirely. If the port is physically damaged, that's a phone repair job. * **Software glitches:** A rare occurrence, but sometimes a phone's software can get into a state where it won't recognise a charger. A simple restart of the phone often fixes this. Failing that, a factory reset (back up your data first!) is a last resort. * **Battery issues:** An old, worn-out phone battery might not hold a charge well or might struggle to accept a charge, even from a working charger. If your phone battery drains quickly even when not in use, this could be a sign. Again, a phone repair shop can test or replace the battery. ## **Practical Steps: What to Do, Bit by Bit** Right, let's put this into a sensible order. When you plug in and get nothing, here's my recommended approach: 1. **Try a different phone/device:** Does your partner's phone charge? What about a tablet? This quickly tells you if the problem is specific to your phone or more general. 2. **Try a different USB cable:** This is usually the cheapest and easiest swap. Grab one you know works with a wall charger at home. 3. **Try a different car charger adapter:** If you have a spare, or can borrow one, pop it in. Again, rule out the charger itself. 4. **Try a different power outlet in the car (if you have one):** Some cars have multiple 12V sockets or USB ports. See if any of the others work. 5. **Check the 12V socket for debris/corrosion:** Car off, get a non-conductive stick and have a good poke around. Clean it up if needed. 6. **Check the fuse for the 12V outlet:** Consult your car manual, find the fuse box, identify the right fuse, and inspect it. Replace if blown, ensuring it's the correct amperage. 7. **Test the 12V socket for voltage:** Use a multimeter or a test light. If no power, it's likely a wiring issue or a deeper electrical fault. 8. **Inspect your phone's charging port:** Clean any lint, check for bent pins. 9. **Restart your phone:** A simple reboot can fix many minor software glitches. ### **My Experience: The Tale of the Van's USB** I remember one job I had on a transit van, fitting out a whole custom sound system. The chap wanted a few extra USB charging points for his tools and phone. Easy enough, I thought. Wired them all up, tested them with my multimeter – lovely 12V at each point, just as it should be. But when he came to pick it up and plugged in his phone, nothing. He was fuming, thought I'd botched the job. I went back in, re-checked everything. Power was there. His phone worked fine with his wall charger. Then I noticed the USB cable he was using. It was one of those really long, braided ones he'd got online for about three quid. Swapped it for a decent, shorter one I keep in my toolkit, and bingo! Charging perfectly. It turned out the cheap cable just had too much resistance over that length to deliver enough current for his particular phone model. Lesson learned: never underestimate the rubbish quality of some cables out there. It's not always the car or the charger. ## **When to Call in a Professional (Or Give Up)** Look, I'm all for a bit of DIY, saves a few quid and you learn something. But there are limits. If you've gone through all these steps and you're still scratching your head, or if you're just not comfortable poking around with car electrics, then it's time to wave the white flag and take it to a professional. * **Persistent fuse blowing:** If you replace a fuse and it blows again immediately, or very quickly, you've got a short circuit somewhere. This needs proper diagnosis and repair by an auto electrician. Don't keep replacing fuses and hope for the best – you could cause more serious damage. * **No power to the socket, and you can't find a blown fuse or wiring issue:** This suggests a deeper electrical fault. Could be a break in the wiring harness, a faulty relay, or an issue with the car's main electrical control unit. That's beyond the scope of a simple DIY fix. * **Multiple electrical problems:** If other electrical accessories are also acting up, it points to a wider issue with the car's electrical system, battery, or alternator. Get it checked out. * **You're just not confident:** No shame in that. Car electrics can be tricky and a bit daunting if you're not used to them. Better safe than sorry. ## **Preventative Measures: Keep Your Charger Happy** A bit of care goes a long way. These aren't magic boxes, they're bits of kit that need looking after. * **Invest in quality:** As I keep banging on about, a decent charger and cable from a reputable brand will save you headaches in the long run. They cost a bit more, but they're built better and perform more reliably. * **Keep it clean:** Regularly check your car's 12V socket and your phone's charging port for debris. A quick blast of compressed air or a gentle clean with a plastic tool can prevent a lot of grief. * **Handle with care:** Don't yank cables out, don't twist them into unnatural positions, and try not to let chargers rattle around loose in the footwell. Store them properly when not in use. * **Use the right charger:** Match the charger's output (amperage) to your device's requirements for optimal and safe charging. Modern fast chargers with USB-C PD (Power Delivery) are great if your phone supports it, but ensure your car charger also supports the standard. ## **FAQs About Car Chargers** ### **Q: Can a faulty car charger damage my phone?** A: Potentially, yes. A very cheap, poorly regulated charger could send inconsistent voltage or too much current to your phone, potentially damaging its charging circuitry or even the battery. It's rare with modern phones having protection, but why risk it? Stick to reputable brands. ### **Q: Why does my phone charge so slowly in the car?** A: Most often, it's due to a low-power USB port in the car (common with factory-fitted ones, often only 0.5A) or a charger that doesn't provide enough amperage (e.g., an old 1A charger trying to charge a phone that wants 2.4A). Using navigation and streaming music simultaneously also draws a lot of power, offsetting some of the charge. ### **Q: Is it safe to leave my car charger plugged in all the time?** A: Generally, yes, for modern chargers. Most draw negligible power when not charging a device. However, in older cars or with some cheap chargers, there can be a tiny parasitic drain on your battery. If you're going to leave the car standing for weeks, it's probably best to unplug it. For daily use, it's usually fine. ### **Q: My car's fuse keeps blowing for the 12V socket. What's going on?** A: If a fuse keeps blowing, it almost certainly indicates a short circuit somewhere in the wiring to that socket. This is a serious issue that needs to be diagnosed and fixed by a qualified auto electrician. Continuing to replace fuses without addressing the underlying short circuit is dangerous and could lead to overheating wires or even a fire. ## **Final Word** Dealing with a non-working car charger is a right pain, no two ways about it. But as I hope I've shown, it's usually something fairly straightforward. Don't panic, don't immediately blame the car, and certainly don't fork out for an expensive garage bill until you've run through these basic checks. More often than not, it's a dodgy cable, a cheap charger, or a blown fuse that's easily sorted. Take your time, work methodically, and you'll likely have your phone juiced up again in no time. If all else fails, pop into SpeakersMag.co.uk and we can chat about getting some proper power delivery sorted for your gadgets – maybe even a subwoofer while you're there! Cheers.