Testosterone level high increase body hair growth?

Maybe but it depends: Testosterone is converted into dihydrotestosterone (dht), which is androgenic - makes you more masculine. Dht is what stimulates male pattern body hair as well as male pattern baldness. Body & scalp hair also depend upon genetics, such as your family & ethnicity. In other words, if everyone in your family has lots of body hair, you will most likely have lots, too. But so can excess testosterone.