I am quoting from The Memoirs of Sherlock Holmes, The Gloria Scott by Arhur Conan Doyle : "Thank you sir, said, the seaman, touching his forelock. I am just off a two-yearer in an eight-knot tramp, short-handed at that, and I WANTS a rest". Is it just a spelling mistake (I am using a book from Wordsworth classics) or 'I' does take an 's' in some situations ?
It's slang, probably colloquial. A New England farmer might say "That fence wants some painting". Also, the author is trying to portray a person with little education, and this is illustrated by their misunderstanding the proper verb tense. In America you might hear someone say "She woke", or "She wake up a little while ago." English verb tenses are hard.