How to select an option of a select (with values loaded from mariadb) that is in an open modal with eventClick of fullcalendar?

I put them in a situation I am making a web application that implements fullcalendar to create an agenda, in which by clicking on any day you show a modal window in which there is a form to register the event, but I I needed to use a select to load the types of vehicles which I achieved with this code:

getvehiculoss();
function getvehiculoss(){
$.ajax({
  type: "GET",
  url: "(aqui pongo la ruta de mi consulta)", 
  dataType: "json",
  success: function(data){
    $.each(data,function(key, registro) {
      $("#SelectVehiculo").append('<option value='+registro.id_vehiculo+' data-icon="../../web/img/vehiculos/'+registro.foto+'">'+registro.placa+'</option>');

    });        
  },
  error: function(data) {
    alert('error al traer los vehiculos');
  }
});
}

and it works for me it loads the select and also makes the insert correctly taking the value of the select, my problem is already when I show the selected data to edit (I use the same modal to edit and add), well my idea was that when I clicked the event that I loaded your information in the modal fields and that I had the option to modify and correctly load all the data in function "eventClick" that has full calendar charge the data type like this:

eventClick: function(calEvent, jsEvent, view) {
    //Abre la modal de ejemplo
    $('#modalprueba').modal();        
    $('#modalprueba').modal('open');   
    */        
    //tomo los valores y los cargo
    $('#txtID').val(calEvent.id_agenda_clase);
    $('#txtTitulo').val(calEvent.title);
    //aqui intento hacer que seleccione el valor en mi select
    $('#SelectVehiculo').val(calEvent.id_vehiculo);
  }

(where "SelectVehicle" is the id of my select and "calEvent.id_vehicle", is what I get from my database), in theory it should work, but it does not, and try to put that same thing out of

$('#calendarioWeb').fullCalendar({"codigo del calendario"})

and if it changes for example I put

$('#SelectVehiculo').val(3);

I will load it exactly as it should, I've been reading for a long time and looking for information on how to do it and I can not find anything that works for me, if they helped me I would be very grateful, thank you