Jeremy Laukkonen is automotive and also tech writer because that numerous major trade publications as well as the creator the a renowned blog and video clip game startup. A fan of EVs since the beforehand 2000s, he continues to be up-to-date top top the myriad complex systems that power battery electric vehicles.

You are watching: Which fuse controls the cigarette lighter


What a swollen fuse watch like.Tydence Davis / Flickr / creative Commons (CC by 2.0)

Cigarette lighter fuses, like all vehicle fuses, blow as soon as the circuit draws an ext amperage 보다 the fuse is designed come handle. If the cigarette lighter fuse is 15 amps, then a attract of much more than 15 amps will cause it to blow. If you change it with an additional 15 amp fuse, and also something top top the circuit is tho drawing much more than 15 amps, climate the fuse will simply blow again.

It might seem choose the easiest solution would certainly be to just replace the 15 amp fuse v a larger fuse, but this is actually an extremely dangerous. If the wiring in the cigarette lighter circuit may be qualified of dealing with a little an ext than 15 amps, yes sir no guarantee the it actually is. And if the trouble in her circuit is in reality some type of short, placing in a larger fuse may reason the wiring to heat up to the point where it might melt or even reason a fire.

While you deserve to buy a circuit breaker together a direct replacement for the fuse that keeps blowing, this is likewise a negative idea, specifically if over there is a short in the circuit. These circuit breakers are valuable in some applications and also have details diagnostic uses, however using one to purposely overload a tobacco lighter circuit is not recommended.

inspect for foreign Objects in Your cigarette Lighter Socket

There space a most reasons because that a cigarette lighter fuse to consistently pop, however one that the an ext common, and often overlooked, is the visibility of a international object in the socket. Due to the fact that cigarette lighter sockets room designed so the the whole body that the metal cylinder is grounded, and also the center pin is hot, that surprisingly straightforward to quick the circuit.

Some vehicles have change holders, or catch-all trays, in the vicinity that the cigarette lighter socket, which renders it dangerously easy for a coin to autumn in. If the happens, the coin may contact both the base barrel and the hot pin within the socket and also cause a quick circuit.

Other metal objects, choose paperclips, or also pieces damaged off indigenous old phone chargers, can likewise become lodged in a cigarette lighter socket. In part cases, friend may discover that such things doesn’t cause a brief circuit every the time, however inserting the cigarette lighter or a 12-volt power adapter causes the fuse to blow immediately.

If girlfriend look inside your cigarette lighter socket v a flashlight and also see a foreign object, yes sir a great chance that removing that will deal with your problem. Simply to it is in safe, you should make sure that you remove the cigarette lighter fuse before reaching within the socket to eliminate the international object. You can then install a brand-new fuse and also check to watch if it still blows.

check the maker You desire to strength From the cigarette Lighter

There is a hard limit top top the current that you can draw from a tobacco lighter socket or any kind of 12-volt accessory socket. If the maker that you want to strength up via your cigarette lighter draws more amperage, then it’s a simple fact that the fuse will blow every time you plug the in.

In most cases, tobacco lighter circuits use 15 amp fuses, yet you can check the fuse crate in your car to be sure. You will do it then want to inspect the maker you’re trying to plug in to see just how much amperage it draws. Cell phone chargers are usually designed to job-related with tobacco lighter sockets there is no blowing a fuse, yet other devices, favor cigarette lighter inverters, can conveniently overload the circuit.

Even if your 12-volt device, charger, adapter, or inverter is design to draw less than 15 amps, it’s still precious inspecting the plug. If the plug is broken, worn out, or has actually something grounding on it, plugging the in may cause a direct short in between power and ground within the cigarette lighter socket.

If you’ve only ever tried come plug one thing right into your cigarette lighter, it may even be worth trying a various 12-volt charger or adapter simply to rule out a problem with the one that you have been using. Or you could additionally use an ohmmeter to examine for one internal quick in your adapter.

troubles With the cigarette Lighter Circuit

Most that the time, a tobacco lighter fuse the keeps punch is brought about by some external problem. However, the always possible that you might be managing an inner problem. If the fuse always blows without even plugging something in, and you have actually verified that there isn’t a foreign object inside the socket, climate there is a trouble somewhere else in the circuit.

In stimulate to completely rule the end a trouble with the socket itself, you deserve to remove it check out if the fuse blows. This is one application wherein a circuit breaker fuse can actually it is in useful, because blowing fuses over and over again to narrow down the source of your trouble could become expensive.

This type of trouble will also be easier to diagnose if you room able to track down a wiring diagram because that your details vehicle because that will present you any components various other than the tobacco lighter the are additionally on the same circuit. Disconnecting every of these contents in turn, if there space any, may likewise be valuable in identify the source of your short.

Another likely cause for this kind of difficulty is a shorted out power wire. That essentially way that the power wire the connects come your cigarette lighter may have rubbed or shed through and also come into call with metal somewhere behind the dashboard. You deserve to look for this kind of quick by checking because that continuity in between the tobacco lighter power wire and also ground.

Locating a quick Circuit

Depending ~ above your details vehicle, it might be exceedingly difficult to actually find the place of this form of short. The short may be situated in a daunting to with a position that girlfriend won't have the ability to find without removing your radio, HVAC controls, or even the dashboard.

While over there are tools for locating shorts in automotive applications, this isn't the kind of device everyone will have laying around. In some cases, the most basic solution might be to just leave your tobacco lighter fuse out permanently and run a new power cable to the tobacco lighter socket.

Rewiring a negative Cigarette Lighter Circuit

If you elect to operation a new power wire to the cigarette lighter socket, it’s really important to usage an proper wire gauge. That also an essential to download an appropriate fuse, in the occasion that you decision to walk this route. In part cases, girlfriend may be able to use a blank spot in her fuse box, and also in other cases, the just option is to operation a power wire straight to the battery.

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In both of this situations, failing to use an ideal fuse might easily result in an electrical fire. And also in any case, to run a new power wire must be her last will after you have ruled out every various other potential reason for your tobacco lighter fuse to punch repeatedly.