My character won't move in C#.

I've translated my controller to C# but I've ran into a little snag that may be little or be gargantuan mass chaos. I must know is the problem the vector3 variable at the top. I believe it was the root of my problem on the other script but I don't see why it would do that. I've checked the values on movedirection and they are changing but my object is not moving. If I haven't been clear enough or you need help deciphering my script leave a comment. If anyone can see the problem or can help to narrow it down please help I know my script is a mess.

 public float currentSpeed;
 public float walkSpeed = 6.0f;
 public float maxSpeed = 15.0f;
 public bool swiming = false;
 public bool climbing = false;
 public float rotateSpeed = 100.0f;
 public bool checker  = false;
 public Vector3 moveDirection = Vector3.zero;
 public float jumpSpeed = 8.0f;
 public float sprintCurHealth = 0f;
 public int sprintMaxHealth = 50;
 private int _PercentFull = 100;
 public bool isSprinting = false;
 float gravity = 20.0f;
 
 private bool grounded = false;
 static bool allowMove = true;
 static bool playerSneaking = false;
 void Awake (){
 sprintCurHealth = sprintMaxHealth;
 }
 void Update(){
 if (isSprinting){
 currentSpeed = maxSpeed;
 }
 else {
 currentSpeed = walkSpeed;
 }
 if (Input.GetKey("left shift")){
 if (Input.GetKey("w")){
 if (sprintCurHealth > 0){
     isSprinting = true;
 }
 if (sprintCurHealth <= 0){
     isSprinting = false;
 }}
 }
 if (sprintCurHealth > sprintMaxHealth){
 sprintCurHealth = sprintMaxHealth;
 }
 if (isSprinting){
 sprintCurHealth =- Time.deltaTime;
     }
 if (!isSprinting){
 sprintCurHealth =+ Time.deltaTime;
     }
 
 
 transform.Rotate(0,Input.GetAxis("Mouse X") * rotateSpeed * Time.deltaTime, 0);
 }
 
 void FixedUpdate() {
    if (Input.GetKeyDown("q")){
  //moveDirection.y = jumpSpeed;
 animation.Play("roll");
 //Roll();
  
 }
 if(allowMove){
  
 if (grounded) {
 moveDirection = new Vector3(Input.GetAxis("Horizontal")*currentSpeed, 0, Input.GetAxis("Vertical")*currentSpeed);
 moveDirection = transform.TransformDirection(moveDirection);
        
 moveDirection *= currentSpeed;
 if(!swiming){
 if (Input.GetButton("Jump")) {
 moveDirection.y = jumpSpeed;
             
 }
 if (Input.GetKeyDown("q")) {
       
 moveDirection.y = jumpSpeed;
 //Roll();
 }
 }
 }
 else if (climbing){
   
 moveDirection = new Vector3(Input.GetAxis("Horizontal"), Input.GetAxis("Vertical"),0);
 moveDirection = transform.TransformDirection(moveDirection);
 moveDirection *= currentSpeed;
     
 }
 }
 if(swiming){
 currentSpeed = walkSpeed;
 }
 }