Does your engine turn over by hand? Does it move easily when you do it by hand? If it does it sounds like your starter is not working correctly. If you get a clicking out of your starter and nothing happens then you know you are getting juice to it. Couple things could be wrong here bad solenoid or brushes or you could have a bad armature or windings which could draw to much current which you could check if you had the right tools such as a clamp on current reader. If not take out the starter and replace it.