Diagonal Raycast - Origin problem

Hey, I've got a small problem when trying to raycast a diagonal line from a moving and rotating object. The problem is that the origin point is not the objects exact position, it is a point slightly to the right of the objects transform.
This would be simple however the objects position is given in world coordinates which means that changing the rays x origin to transform.position.x+3 will not always move the ray to the right of the object, but on the x axis of the world..
Here's the code:

 var diagonal = transform.TransformDirection(1, 0, 1); 
 
 Debug.DrawRay(Vector3(transform.position.x-3, transform.position.y, transform.position.z), left*34, Color.blue);

I'm sure there is a simple way of getting the rotating objects local position and moving the ray accordingly. I have tried localPosition however since the object has no parent it still returns world coordinates.
Thanks