Stop these experiments and invite a competent specialist. He will check your grounding rod and also make the correct connection. I won’t teach you and tell you what to do. You don’t have the necessary measuring equipment and knowledge for this anyway.
Besides, it’s a big responsibility!
UPD: You are so careless and completely unaware of the dire consequences that could result.
UPD2: I think and insist that this issue should be closed.