War Thunder BMPT The error was that the turret stopped and the right-hand machine gun stopped when

There is also an error here: when I disable the front machine guns from below, I cannot fire from the front machine guns from above on one side (the right side), and some now the turret completely stops; I cannot move it left or right.

I’m having trouble seeing what your issue is. You’re selecting to fire from only one specific gun and the others then won’t follow your aim or fire, this is normal. Am i missing something?

I want to stop the machine guns from below, and when the machine guns from below stop, the machine gun from above on the right side also stops, and the turret also stops when I move right and left sometimes.

I still don’t understand, you’re selecting the top left one, so every other weapon will stop. This is normal. If you select the top right then only that one will fire and every other weapon stop.

in the video your are switching your primary weapon selection to the top left canon and then try to use the ammunition in the top right canon, this wont work as you have the top left one selected. The Y menu selection is not the same as the quick menu selection.
Here are the different key binds:

(these are my personal key binds, yours might differ)

When I try to disable the blue machine guns, the yellow machine gun also stops firing. I can’t fire the yellow machine gun, which is the right one.

Please go and test it. Stop the blue machine guns and try firing from the right and left sides of the machine guns from above. If one of them is not working

You can only fire one of the top guns at a time, you switch by either being in the “all” selection of guns and switching ammunition or by being in single gun selection and the switching primary gun again.

You’re trying to use two different integrations (and key binds) that do not combine with each other. When you are switching the primary gun you are forcing it to use only one of the main guns, if you switch using the “Y” menu again it will use the other main gun. Using the “1, 2, 3” keys only selects ammunition and not the specific gun, but when you’re in “all” mode switching ammunition also switches the gun due to the ammunition selected only being available in that gun. You can not be in single gun selection and switch to ammunition that is in another gun.

I don’t know if i can explain it better than that.

But the problem is that you can’t select the left primary gun when switching between the Primary Gun options.
Only the toggle between Left and Right grenade launcher using the Secondary Weapon multi function menu selection or keybind works. Switching Primary Gun + Ammo Belt to fire from the corresponding gun doesn’t work. The turret will just freeze on the second Primary Weapon selection when it should activate the Left Primary Gun.
The primary guns can only be switched and work in ALL mode by selecting the ammo belt, but then it also fires the grenade launchers. This is also happening to the BMPT-72, the turret freezes once the Primary Weapon has been selected for the second time. Fired up a bug report for it

https://community.gaijin.net/issues/p/warthunder/i/KAw42BV5SWBD

Also a video with step by step subtitles

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If you look carefully, the second time you switched weapons, the turret stops moving but the atgm launchers still move. You basically selected the atgm launchers over the cannons. Now for some reason, not only do the launchers not have a separate sight, but you somehow can’t turn the turret either, so basically you can’t aim your atgms… Worth reporting this “bug” to gaijin.
I advice you bind keys to switching weapons and whenever that happens just switch again until all you have selected is your main cannon.

Responded in the bug report as well but I’ll say it again here for others.
The ATGM launchers are elevating even with the Secondary Weapons selected and firing, The Grenade launchers in this case. ATGMs are active and can be fired with every weapon selection.
The second Primary Weapon selection is just bugged. It should either just have one Primary Weapon and the cannons selected using the ammo belts or have two Primary Weapons where Belt 1 fires from the Right cannon and the second Primary Weapon use Belt 2 with the Left Cannon, which is currently broken.