Briggs & Stratton 12HP Engine: Yard Man Ride-on Mower, Ignition Switch & Charging Coil Issues

Hello to all forum members!
At the beginning of my post I will try to accurately describe the situation and the problem that has been bothering me for a long time. Some time ago I bought a Yard Man ride-on mower with a damaged engine (broken connecting rod). I was able to buy an efficient engine of the same power and install it in the machine. However, there was a problem with starting the engine. Turning the key in the ignition switch, the starter does not react at all. However, when I disconnect the cables from the charging coil, everything is fine. The engine starts with the arrow. Charging on a running engine is about 14V. Even after connecting the cables going to the charging coil, the engine does not go out. After turning off, again zero reaction to the key. The solenoid is operational. I took a photo of the ignition switch and the cube connecting the wires of the charging coil. I am asking for suggestions on what to do here.

Check the electrical installation carefully and check the "path" that the current flows from the ignition switch to the starter.
The most common is the protection under the seat (the starter only turns when you are sitting) and it can be led through a relay. Unfortunately, I do not have a diagram to give a more precise hint.

This engine does not sometimes have an oil level sensor that prevents too little start?

There is no sensor under the seat. When I sit on the chair it is the same, it does not give electricity to the ignition at all. I have recently noticed that after 2-3 min. there is a beep somewhere under the seat, under the body and for a few seconds electricity goes to the ignition and I can start the engine. After turning off it is the same, after turning the key, zero reaction until it beeps under the seat ... and so on; /

There must be a relay there. Check it out.

Here is a diagram of another model, it may be useful:
https://www.elektroda.pl/rtvforum/topic2388162.html

Pay attention to the PTO Swich.

Martin 007 wrote:

. Turning the key in the ignition switch, the starter does not react at all.

Rycho T wrote:

Disconnect the cable going to the ignition coil (the thin one), as then it will light up as I wrote above.

How could that make any sense?

I will add that the cables (see the first photo) that go in the conduit run from the charging coil to the ignition switch (red and yellow). Then the yellow wire in the ankle from the ignition switch separates, but is not connected anywhere.

Hello. Here is a diagram, maybe something will help.