Solar has nothing to do with it. Voyager uses hydrazine, of which over 80% has been used up over the years. They simply use not that much of it as it's not for

Solar has nothing to do with it. Voyager uses hydrazine, of which over 80% has been used up over the years. They simply use not that much of it as it's not for thrust, but for aiming at Earth more or less.