This post is about a 2002 f4i

ok when i try to start my bike it wont turn over fuel pump engages and everything bank angle sensor is good and all but my question deals with the starter. there is a cable that connects to the top of it and runs to the starter relay now obviously thats the power wire for the starter. now it needs a ground where does that come from i know this might be why she wont turn over but im ok with electrical but a lil scared bout it cause we all know one wrong thing and u can fry the circut and cause more problems. So anyways where does this ground come from off the starter and where does it go to. And where is the best place to ground the battery??