Change Weapon by its Script int

hey guys i wanted to ask how i can Set a Weapon on in this script by setting the selectWeapon int to a 1or 2 or 3 i tried getting this ....

 if (selectWeapon >= transform.childCount - 1)
                 selectWeapon = 0;
             
             else
                 selectWeapon++;

in to my

 public void Weapon_1_Selected(){
 }

this is for my savegame manager. all the parts work this script shares its selected weapon int to my loadSave Script and i can load it back in to the selecweapon int works fine but i cant get it woking that it will go to weapon 0 if the selectweapon int is 0. i even tried this

 void Selectweapon()

{

} here is the script...

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class WeaponSwitchMouseWheel : MonoBehaviour
 {
     public Animator anim;
     public GameObject[] Weapons;
     public GameObject Player;
  
     public GameObject CurrentWeapon;
  
     public int selectWeapon = 0;
 
     public bool isWeapon_1 = false;
     public bool isWeapon_2 = false;
     public bool isWeapon_3 = false;
 
     void Start()
     {
          //anim = GetComponentInChildren<Animator>();
         Selectweapon();
         Player = GameObject.FindGameObjectWithTag("Player");
         Player.SendMessage("Weapon_1True");
         Debug.Log("selected weapon = 0 ");
 
     }
     public void Weapon_1_Selected()
     {
         if(isWeapon_1 == true)
         {
             // do nothing
         }
         else
         {
             isWeapon_1 = true;
             isWeapon_2 = false;
             isWeapon_3 = false;
 
                 selectWeapon = 0;
         }
 
         
     }
     public void Weapon_2_Selected()
     {
         if(isWeapon_2 == true)
         {
             // Do nothing
         }
         else
         {
             isWeapon_1 = false;
             isWeapon_2 = true;
             isWeapon_3 = false;
             
                 selectWeapon = 1;
         }
         
     }
     void Update()
     {
         
         int previousSelectedWeapon = selectWeapon;
 
         if (Input.GetAxis("Mouse ScrollWheel") > 0f)
         {
             CurrentWeapon.GetComponent<Animator>().enabled = false;
             anim.SetBool("WeaponSwitcherAnim", true);
             anim.SetBool("WeaponSwitcherAnimIlde", false); 
             if (selectWeapon >= transform.childCount - 1)
                 selectWeapon = 0;
             
             else
                 selectWeapon++;
            // Weapon_1_Selected();
         }
 
         if (Input.GetAxis("Mouse ScrollWheel") < 0f)
         {
             CurrentWeapon.GetComponent<Animator>().enabled = false;
             anim.SetBool("WeaponSwitcherAnim", true);
             anim.SetBool("WeaponSwitcherAnimIlde", false);
             if (selectWeapon <= 0)
                 selectWeapon = transform.childCount -1;
             else
                 selectWeapon--;
             //Weapon_2_Selected();
         }
         if (previousSelectedWeapon != selectWeapon)
         {
             StartCoroutine(WaitForAnimationTime());
             CurrentWeapon.GetComponent<Animator>().enabled = true;
         }
         if(selectWeapon == 0)
         {
             Player = GameObject.FindGameObjectWithTag("Player");
             Player.SendMessage("Weapon_1True");
             isWeapon_1 = true;
             isWeapon_2 = false;
             isWeapon_3 = false;
             
                
 
 
         }
         if (selectWeapon == 1)
         {
             Player = GameObject.FindGameObjectWithTag("Player");
             Player.SendMessage("Weapon_2True");
             isWeapon_1 = false;
             isWeapon_2 = true;
             isWeapon_3 = false;
             
                
 
         }
 
     }
     IEnumerator WaitForAnimationTime()
     {
         
         
         yield return new WaitForSeconds(0.75f);
         Selectweapon();
         anim.SetBool("WeaponSwitcherAnim", false);
         anim.SetBool("WeaponSwitcherAnimIlde", true);
         
     }
     void Selectweapon()
     {
         int i = 0;
         foreach (Transform weapon in transform)
         {
             if (i == selectWeapon)
                 weapon.gameObject.SetActive(true);
             else
                 weapon.gameObject.SetActive(false);
             i++;
         }
     }
 
 }