How to check a car fuse

What are you talking about stupid things ...
How can the meter make you foolishly?
You have a poor way of measuring and interpreting results ...

@ tomek122 In my free time, I will show you how the meter makes you laugh.
But let me tell you that you can earn a lot for those who check the fuses with a meter.
Therefore, I advise against this method.

T5 wrote:

Instead of a fuse, I connect an H7 bulb.

Why don't you use 12V 20W bulb only H7?

I am waiting for the information, as the meter does bambuko ...
Not once have I been disappointed ...

@ CYRUS2 I use what I have at hand, I'm not picky. The effects are not the means but the results. It is not an art to work in a workshop that has everything, the trick is to deal with what is at hand.

Now tell me what are the differences in working with what you propose and what I suggested. (H7 aka 12V 20W)

tomek122 wrote:

I am waiting for the infonet, as the meter does bambuko ...
Not once have I been disappointed ...

The meter causes no current load. When measuring with a meter, even a rotten wire may show continuity, but it will not be able to light up a 5W bulb.

tomek122 wrote:

I am waiting for info, how the meter does bambuko ...
Not once have I been disappointed ...

Last week I made ? 4 for a fuse replacement.
PLN 100 for checking, PLN 300 from the client. He came with the owner of the repair shop that he was repairing.
They exchanged parts for 4 thousand. PLN.
They checked the fuse with a meter next to me, I checked it with a tester.
The client brought the case to court ... Life ..

tomek122 wrote:

Not once have I been disappointed ...

Because you don't do much about it. How many times, for example, have you encountered that the fuse is not blown but broken? Because I do many times. In addition, you should rather avoid removing fuses to check them, the customer can make a fuss even for the fact that the radio settings have been deleted, and you can also do more "damage" in some cars.

In fact, I happen to do this "occasionally" but as I said, I have never had such a case before.

T5 wrote:

I use what I have at hand, I'm not picky.

Thanks for the specific answer.

T5 wrote:

Now tell me what are the differences in working with what you propose and what I suggested. (H7 aka 12V20W)

I was wondering if it was not about the burden.
I do not deal with car service. I entrust all the work related to electrics to an electrician.
Why ?
Because the car is a complicated installation - you have to know it.
Not knowing what is where a huge amount of time would be wasted.
No sense.
I drive a Lanos car. (The previous Lanos was 20 years old)
Interestingly, my fuse has never blown.
I have never stood in the street because of a breakdown.
Bravo for Korean constructors.

I myself drive something similar to what tomybb showed and although I am not a complete layman, I did not pay attention to it.
While the topic may be trivial, sometimes you learn something that you don't know.

ociz wrote:

In addition, you should rather avoid removing fuses to check them, the customer can make a fuss even for the fact that the radio settings have been deleted, and you can also do more "damage" in some cars.

Here, perhaps more as a curiosity, I present a table developed by engineers from Mercedes. It is mainly related to the problem of checking the quiescent current in cars with a CAN network. Each time a fuse is removed in order to fit an ammeter in its place, it leads to several minutes (sometimes) waiting for the system to go into "sleep" mode. The new method is to measure the voltage drop across suspect fuses. Having such a table and the value of the fuse, it is possible to approximately determine the current flowing through it at a given moment.

ociz wrote:

the customer can make a fuss even for the fact that the radio settings have been deleted

It's still good. I remember once a client came back after the inspection that "the mechanic broke his radio". After a short investigation, it turned out that the mechanic was disturbing the radio and he simply turned it OFF. "Well, because the radio always played, and after leaving the site it did not play ..." I observe that here in Ireland, when you do not listen to the radio, you simply turn it down or switch to some other input that is inactive at the moment . Unfortunately, pressing the key and holding it for a moment in order to completely turn off the radio exceeds the intellectual abilities of the natives. There may be some super-hyper system with a dozen or so speakers and the graphic equalizer is still in the position in which the car left the factory. Sometimes I get the impression that the wipers are turned on by the dealer when picking up the car - the heat is pouring out of the sky, and the wipers are working ...
But this is by the way - to improve the mood

A very good way described by engineers from Mercedes. You only need a fairly good quality meter, of course, with equally good cables.

skywalker2 wrote:

you need a fairly good quality gauge

It cannot be considered a scaled measuring tool. So what if the meter will be accurate if fuses from different manufacturers may have discrepancy in resistance. But the measurement will certainly show us the "branch" of the installation in which something is happening without the troublesome removal of fuses and putting the system to sleep each time. Even an estimate of the flowing current will be helpful in the diagnosis. I admit that I have used this method several times and it is really helpful.

Of course, the point is not that the meter should be a scalable measuring tool, but it would be advisable that in the mV range it should measure more what is on the fuse than the self noise and wires, as cheap meters do. For my workshop, I made an invention using blown fuses as shown in the photo. I connect to the wires a light bulb with a power depending on the estimated current that the protected circuit can take, plus an ammeter (of course, in series with the light bulb, not instead, so as not to blow it up in the event of a short circuit). This solution saved me a lot of time at work.