I have been thru many engines and starters, GM280 makes a great point, if the ground is not clean and tight and your not using the proper gauge wire you can fry the wire and not get any power. If you jump the starter and nothing and your sure the wires are grounded and tight then manually turn the crank once to make sure the starter isnt stuck in place, then try again, if nothing then more than likely the starter is shot. Can also hit it a few times maybe break it loose....but only if your fairly certain its bad...just some thoughts.