Collider Don't work

I making a game. You need bomb car and heal with water...

 var Gyfka : int;
 var GoodTag : String[];
 var BadTag : String[];
 var Ugnis : Transform[];
 var Dumai : Transform;
 var Groteles : Transform;
 var Ratai : Transform[];
 var Sprogimas : GameObject;
 
 function OnCollisionEnter(other : Collision){
 Debug.Log("Test");
     if (other.collider.gameObject.tag == GoodTag)
     {
     Gyfka += 6;
     }
     if (other.collider.gameObject.tag == BadTag)
     {
     Gyfka -= 37;
     } 
 }
 
 function Update(){
     if(Gyfka >=25){
     Dumai.particleEmitter.emit = true;
     }
     if(Gyfka >=10){
     Ugnis.particleEmitter.emit = true;
     }
     if(Gyfka >=1){
     Instantiate(Sprogimas, Groteles.transform.posion, Quaternion.identity);
     Ratai.GetComponent(HingeJoint).enabled = false;
     }
 }
 
 function OnGUI(){
 GUI.Box(new Rect (10,Screen.height - 200,200,20), "Riebulkos Mašinos Sveikata:" + Gyfka);
 }

I working with this script for 3 days. It starts me angry WHAT I DID WRoNG I put this on car's collider