Jeremy Laukkonen is technology writer and also the creator of a well-known blog and also video game startup. He likewise ghostwrites write-ups for countless significant trade publications.

You are watching: Where is the fuse for the cigarette lighter


What a blvery own fusage looks favor.Tydence Davis / Flickr / Creative Commons (CC BY 2.0)

Cigarette lighter foffers, choose all car fsupplies, blow when the circuit draws more amperage than the fuse is designed to handle. If the cigarette lighter fusage is 15 amps, then a attract of even more than 15 amps will reason it to blow. If you replace it with an additional 15 amp fuse, and also something on the circuit is still illustration even more than 15 amps, then the fusage will certainly just blow again.

It might seem favor the simplest solution would certainly be to simply relocation the 15 amp fuse via a larger fuse, but this is actually extremely dangerous. While the wiring in the cigarette lighter circuit might be qualified of taking care of a small more than 15 amps, there’s no guarantee that it actually is. And if the problem in your circuit is actually some form of short, placing in a bigger fusage may reason the wiring to warmth approximately the allude where it can melt or even reason a fire.

While you have the right to buy a circuit breaker as a direct replacement for the fusage that keeps blowing, this is likewise a negative concept, especially if there is a short in the circuit. These circuit breakers are beneficial in some applications and have particular diagnostic provides, but using one to deliberately overload a cigarette lighter circuit is not recommfinished.

Check for Foregime Objects in Your Cigarette Lighter Socket

There are most reasons for a cigarette lighter fuseto consistently pop, but one of the even more prevalent, and also often overlooked, is the visibility of a international object in the socket. Due to the fact that cigarette lighter sockets are designed so that the whole body of the steel cylinder is grounded, and the facility pin is warm, it’s surprisingly easy to brief the circuit.

Some vehicles have readjust holders, or catch-all trays, in the vicinity of the cigarette lighter socket, which makes it dangerously simple for a coin to loss in. If that happens, the coin might call both the grounded barrel and also the hot pin inside the socket and cause a short circuit.

Other metal objects, choose paperclips, or also pieces damaged off from old phone chargers, can additionally become lodged in a cigarette lighter socket. In some cases, you may find that such an object doesn’t reason a brief circuit all the time, however inserting the cigarette lighter or a 12-volt power adapter causes the fuse to blow automatically.

If you look inside your cigarette lighter socket with a flashlight and also view a foreign object, there’s a great possibility that rerelocating it will fix your problem. Just to be safe, you should make certain that you rerelocate the cigarette lighter fusage before getting to inside the socket to rerelocate the international object. You have the right to then install a brand-new fusage and also inspect to see if it still blows.

Check the Device You Want to Power From the Cigarette Lighter

Tright here is a difficult limit on the existing that you deserve to draw from a cigarette lighter socket or any type of 12-volt accessory socket. If the tool that you desire to power up using your cigarette lighter draws even more amperage, then it’s a simple fact that the fuse will blow eexceptionally time you plug it in.

In the majority of situations, cigarette lighter circuits use 15 amp fuses, however you have the right to check the fuse box in your vehicle to be sure. You’ll then want to examine the gadget you’re trying to plug in to check out exactly how a lot amperage it draws. Cell phone chargers are generally designed to job-related through cigarette lighter sockets without blowing a fusage, however other gadgets, like cigarette lighter inverters, have the right to quickly overfill the circuit.

Even if your 12-volt tool, charger, adapter, or inverter is designed to attract less than 15 amps, it’s still worth inspecting the plug. If the plug is broken, worn out, or has actually somepoint stuck on it, plugging it in may reason a straight short between power and ground inside the cigarette lighter socket.

If you’ve just ever tried to plug one point into your cigarette lighter, it may also be worth trying a different 12-volt charger or adapter just to dominion out a trouble with the one that you have been making use of. Or you might also use an ohmmeter to check for an internal short in your adapter.

Problems With the Cigarette Lighter Circuit

Many of the moment, a cigarette lighter fuse that keeps blowing is caused by some outside difficulty. However, it’s always feasible that you might be managing an internal trouble. If the fuse constantly blows without even plugging anything in, and also you have actually showed that tbelow isn’t a foreign object inside the socket, then tright here is a trouble in other places in the circuit.

In order to entirely dominion out a problem via the socket itself, you can rerelocate it watch if the fuse blows. This is an application wbelow a circuit breaker fusage have the right to actually be helpful, given that blowing foffers over and also over aacquire to narrowhead down the source of your problem can become expensive.

This type of problem will certainly also be simpler to diagnose if you are able to track down a wiring diagram for your certain car since that will present you any type of components various other than the cigarette lighter that are likewise on the very same circuit. Disconnecting each of these components consequently, if tright here are any type of, might additionally be useful in determining the resource of your short.

Anvarious other likely reason for this form of trouble is a shorted out power wire. That fundamentally means that the power wire that connects to your cigarette lighter might have rubbed or shed through and also come right into call via metal somewbelow behind the dashboard. You can lookfor this form of brief by checking for continuity between the cigarette lighter power wire and ground.

Locating a Short Circuit

Depfinishing on your particular automobile, it might be exceedingly challenging to actually find the area of this kind of short. The short may be located in a difficult to reach a place that you will not be able to discover without removing your radio, HVAC controls, or also the dashboard.

While tbelow are gadgets for locating shorts in automotive applications, this isn"t the type of tool everyone will have actually laying about. In some situations, the easiest solution might be to simply leave your cigarette lighter fusage out permanently and run a brand-new power wire to the cigarette lighter socket.

Rewiring a Bad Cigarette Lighter Circuit

If you elect to run a brand-new power wire to the cigarette lighter socket, it’s extremely essential to use an appropriate wire gauge. It’s also essential to install an correct fusage, in the event that you decide to go this route. In some situations, you may have the ability to use a blank spot in your fuse box, and also in various other situations, the just alternative is to run a power wire directly to the battery.

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In both of these situations, failing to use an appropriate fusage might quickly result in an electrical fire. And in any instance, running a brand-new power wire have to be your last retype after you have ruled out every other potential reason for your cigarette lighter fusage to blow repetitively.