Castel Garden, B&S 15.5 HP - the charge indicator does not go out

Hello and help please, as in the subject I have a tractor with a Birggs engine and the charging light is on. A few years ago, around 5, I bought it with this feler and worked like that until this year. I checked the charge with the meter and it was OK, 13.5V was enough to recharge and burn without any problems. This year, however, the time has come to overhaul the engine, got new rings, sealing, head overhaul, oil, a new candle and - it was hard for him to turn the engine on this battery. I connected the rectifier to him and started walking together and began to reach. The charge indicator obviously lit up (as usual) all the time. Each time he smoked heavily, until I finally checked with the meter and here the lack of charging, the voltage regulator fell. I bought a new one, I secured it with a 25A diode and the charging returned to normal. The tractor finally began to smoke lightly (of course it worked a little bit), but the charging indicator lights up. I thought how a renovation would be a renovation and it could finally be repaired, because once it stops charging me again I will not know that there is a feler. The problem is that I do not have any schematic for this module and in addition I am not sure if this is the correct module for this model, maybe someone fell and assumed what he had, so that it went. I will also indicate that the other controls work correctly. Maybe you have some ideas on how to deal with it, maybe you have some diagram of this module to check how this loading control is made. I would not like to use radical modifications such as mounting a voltmeter, etc. Please help, because I didn't find anything on this topic in the forum. I also enclose a picture of the module which was demonstrative in the forum, identical in appearance to what is in my mower. Thank you for your help now and I am waiting impatiently because the mowing season is beginning.
PS
I was able to take photos of my mower and attach them to make it clear what is 100% under my hood.

The module does not look too complicated, probably a medium electronics engineer can fix it without a schematic. I bet that the regulation of charging is improved there some window comparator or other creation on the LM358 which can be seen there, it probably controls some executive switching on one of the relays. I suspect that the charging indicator is simply connected to the comparator output and is designed to glow when the actuator is turned off and thus I suspect that the problem does not end with this indicator, which probably consists of a resistor and LED, but it is deeper .

Thank you buddy for your interest in my topic, but I will say so - in my post I wrote that charging is and is solved very simply, while you flashed intelligence and did not notice this fact. If I were to bring it to "medium electronics" then I wouldn't bother anyone writing stupid posts. The fact that LM sits there, I also noticed, and that the problem does not end with the control itself is obvious. Maybe I'm not a super electronics specialist but I manage, and this post was written so that someone who has access to some map on this topic will share and I will not have to blind the paths as it is built. Thank you and best regards.

It's a control panel, not a charging module.

That's right, it's a control panel. Yesterday I took out the panel on the table, connected it to the power supply and made a few measurements with different voltage (power) parameters - everything points to LM. Maybe this week I'll buy a scalacz and substitute. Well, you have to do without a map, because as I can see, the theme of the pattern is not simple and obvious. The post was watched by 100 people, but you can not see very much access to such things as diagrams, or something protected by websites, or simply the panel is a replaceable element that nobody repairs, only replace it with a new one in case of failure.

The panel is not responsible for loading. This is just information for the operator. Show me what you're loading. Diode or module.

As you say, this is a control panel, and I wrote about loading properly in my first post. Read it carefully. Nevertheless, the problem with the glowing light in my case is independent of whether the charging works properly or not. That's why I finally picked on this control.

I read you do not have charging. Repairing the panel will not fix this. First check if anything comes out of the alternator.

Repair completed successfully. As I suspected, LM358 was damaged. now the indicator lights up and goes out near 12.8V. This can be seen very nicely by connecting the module on the table to the power supply, it squeaks a bit because other plugs are disconnected and the module sees an error (damage) but it does not bother to observe the principle of the system operation with changing supply voltage.
Thank you all for your interest. I leave the topic open for now, because maybe someone will be found who would have a diagram for such a module. It is worth having it because it would make work easier.