I have a 16.5 HP Briggs and Straton riding lawnmower, I woker fine 2 weeks ago and now that I have replaced the belto on it, it won't start. I thhought it was the battery but it is new and fully charged. What could it be... I know there are 3 kill switchs on it but I don't know where the're located. Could someone please help me?? :(

Are you sure the belt is on correct and not routed wrong and is so tight that it won't let engine turn over?