how to check the alternator after removing it, i.e. on the table

Hello, I'm specifically talking about how to check the alternator removed from the car
and I do not mean a visual check, because the brushes can be removed and
check their condition rings as well as strong puncture on the rotor
or standing also an ordinary meter, but I know that it does a special one
cable combinations together with the excitation bulb and this connects to the alternator
together with the battery and the drill drives, if it is ok, the drill decreases
rotation and the bulb goes out. Please send me this combination diagram
these cables and connecting them to the alternator, best regards GREG if anyone
would know links to such pages with descriptions, please share them with me.

First, what alternator do you want to check

you do not need a diagram, connect the "+" battery to the charging terminal (usually an eight screw or a tip for a thick knector), minus to the body. You connect the bulb between the battery plus and the clamp from the charging lamp and the system is ready. With an efficient alternator, the bulb will go out if it can glow be damaged diode. You can check them, but probably by desoldering the ends of the stator windings. Good luck!

Thanks a lot, that's me, greetings, and as for the type of alternator, I'm just asking, not having any in mind, I am dealing with a mechanic, so I wanted to know. Thanks a lot.

Hello,
I have a question about checking the alternator, but a computer-controlled one, i.e. it has a 5-pin connector. (E.g. Mercedes Actros).
Is it possible to build a circuit, are there maybe schematics?

needed, unless you can accelerate the alternator to the right speed yourself

wake him up

You gave the bulb.

Quote:

So far, I have not had a case with suspended brushes yet

It happened to me in cars where the injection pump is above the alternator and diesel was poured into it, after repairing the pump (sealing), the oil dries up and the brush holder is stuck with sludge from brush dust and liquid manure

There will be even half of the brush, but the spring has no force to push it further and remains torn in the position in which it dried. In sprinter I had that too.

How often do the diodes in the alternator get damaged? For a short circuit or a break?

On short circuit

Break and open are probably the same.

On the skating rink, we most often fall over on the other involved in sliding. ;)

So I am to understand that both options are equally likely?
Hmm ... I would rather suspect that the diode burns out for a break.

HarrisonBergeron wrote:

I would rather suspect that the diode burns out for a break.

There is no rule, but there are conditions

And how to classify a diode that behaves normally on the meter and the tested 21W bulb has a break?
Anyway, what's the difference, when the diode is damaged, how the entire bridge needs to be replaced anyway

I am glad that I found a friend. I will not hide that I am counting on your help. So far, no one has been able to provide me with professional advice.
If possible, I would like to move from the general topic of alternators to a specific example (if necessary, please separate it into a separate thread).
Where are the excitation diodes in this alternator? (photo)

This is an alternator from the Ford Mondeo mk2. 3-pin plug. Battery plus - red arrow.
As for the power diode, the multimeter shows:
decrease of 0.37 in the conduction direction (body - blue, blue - red),
and infinity in the reverse direction (red - blue, blue - body).
Measurement with the voltage regulator removed, but without the bridge rectifier removed. In the photo I marked only 4 blue arrows, but the measurement result is the same regardless of which diode or winding end I measure.

Now let's get to the things I don't understand:
What is the connection of the voltage regulator with the bridge marked with the green arrow?
If this is the output of the excitation diodes, why is there such a solid connection (a thick piece of copper sheet) between the plus and the voltage regulator (red arrow)? The excitation will probably be on this copper connection (???)
I have looked at many Mondeo alternator diagrams, none match mine, but in some I noticed there is a direct connection of one of the alternator stator windings to the voltage regulator (bypassing the excitation diode). Some controls or something ... I don't know.
This green connection, maybe that's it? The more that the measurement with the green-blue multimeter gives a result of 0 (in both directions).

The symptom is that the charging indicator is on in the car and there is no charging.

This answer actually dispels my doubts - defective voltage regulator;
and confirms my suspicion that the excitation diodes are not there - although I have already heard the opinion (car electrician) that the diodes are flooded in this plastic.

Thanks.