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How to check a car fuse

T5  Cool? (+17)
Practically the best device for checking a fuse is the sight and the tester designed for this. We check the fuse under load. The meter can, in short, turn us into a balloon.
A simple sampler from the market for PLN 5-10.

This one was slightly modified for my needs.



We start checking with checking the instrument. Crocodile clip to ground, and the tip to the plus: shines = working.



We start checking our fuses. In this case it is possible to check without pulling out.
And remember that if we check the fuse from, for example, parking lights, we have to turn on the lights.
Checking yourself is very easy.

The crocodile clip to the ground, and the tip touches the fuse, first on one side, then on the other. When the test lamp is lit here and here, our fuse is working.



Here is an example of a functional fuse - the wire is intact.



And here the same fuse blown.



Another curiosity - in cars you can also find automatic fuses, like home ones - when it pops out, press a button and it works. It looks like.

The one in the picture is "stamped"



And here it is ready to go again.



There are also fuses that need to be pulled out to be checked. We can also check them in a simple way. Here is an example of a circuit breaker.



And one more important thing - the fuse, as the name suggests, is supposed to protect something. This must be the weakest element in the protected circuit. Replacing it with a larger one will end up with burning something, installation, driver, car, etc.

About Author
T5
T5 wrote 12844 posts with rating 4044 , helped 1002 times. Live in city Dębno. Been with us since 2010 year.

Comments

klamocik 31 Jul 2020 11:38

And all you need is an ordinary working light bulb, anything you want from this car, and a piece of wire. [Read more]

sp3ots 31 Jul 2020 11:52

Hello ! So how converted? It's a waste of time to rework. [Read more]

djtrebla 31 Jul 2020 16:25

I have a car, so the topic interested me very much. I read and "hung" over the word "lightly". I carefully announced the first 2 photos and I do not see any modifications in this device. Maybe the... [Read more]

ociz 31 Jul 2020 16:45

It is dimly lit, the bulb is probably changed to 24V. I recommend this type: https://obrazki.elektroda.pl/7668136900_1596206706_thumb.jpg Relatively robust, affordable and bulbs can be changed without... [Read more]

motojuza 31 Jul 2020 17:05

I mounted the LEDs in anti-parallel to my test tube. You can specify Polarity. [Read more]

tomybb 31 Jul 2020 17:16

The light bulb may have the advantage that in the case of lower voltage, some decrease, it will glow less. We notice that something is wrong. [Read more]

CMS 31 Jul 2020 17:26

I know that the majority of society does not sin with intelligence, but it is probably not so bad that you have to explain to someone how to check the fuse. The more that we are on the technical forum. ... [Read more]

ArturAVS 31 Jul 2020 17:52

Did you burn for the text on purpose? :D They have been used in commercial vehicles (MAN, for example) a long time ago, useful when looking for short circuits, although I use a slightly different method. ... [Read more]

tomybb 31 Jul 2020 17:58

Even a long time ago, only they looked like switches. In city buses. (either Jelcz or Ikarus, I don't know anymore). Something around the '70s. In my opinion, the problem is different. As the... [Read more]

kowal011 31 Jul 2020 18:02

More often than blown fuses, I see tarnished fuse / receiver sockets. The test tube won't do anything. The search for the broken mass will also fail. As looking for faults in the installation in the... [Read more]

ArturAVS 31 Jul 2020 18:19

Just like the myth that deleting errors (fault codes) will repair the vehicle. As for the installation of oversized fuses, I had a case around 2009 that the 10A fuse from the dipped beam was blown. The... [Read more]

tomybb 31 Jul 2020 18:29

Sometimes the reason is obvious, easy to find, and sometimes on the contrary, there are factors such as temperature, humidity, shocks etc. Something happens "once in a time". [Read more]

T5 31 Jul 2020 18:36

Of course :) Losses must be sometimes :) I use a different method to search for a short circuit. Instead of a fuse, I connect an H7 bulb. When it shines, it is a short circuit - and I can safely... [Read more]

ArturAVS 31 Jul 2020 18:56

I am exactly the same :D that's why I wrote earlier; Because after several dozen minutes of searching, there will be a bucket of burnt fuses :D . It is also a mistake to put new ones on the receivers... [Read more]

kotbury 31 Jul 2020 19:11

And there are also - mainly in cars from behind the great water - circuit breakers - i.e. circuit breakers - mainly in circuits permanently exposed to overload (e.g. older electric windows). They are bimetallic... [Read more]

Marian B 31 Jul 2020 19:30

You can also slightly facilitate / automate the search for some "important" blown fuse in your car using LED adapters. Then the blown fuse is immediately visible, the replacement is easier because there... [Read more]

Jacdiag 31 Jul 2020 20:17

Jelcz under license from Berliet. The Ikaruses had ceramic. https://obrazki.elektroda.pl/6018047400_1596219242_thumb.jpg [Read more]

smerdendes 31 Jul 2020 23:13

https://obrazki.elektroda.pl/8886960100_1596229517_thumb.jpg It is also worth adding that cheap fuses that can be purchased at gas stations and supermarkets are poorly suitable for use and are even... [Read more]

Tomek515 31 Jul 2020 23:55

Some time ago I bought one in case of W but your attention will be remembered by me. You can actually forget yourself. smerdendes The truth was they were battleships, and very clear about the d... [Read more]

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