Friend's KATANA 750 wont start
 

ok here is the deal, he blew out the 2nd gear on one motor so we got the new one put in and it wont fire. The thing is before we took it out the bike turned over and trided to start but now the bike doesnt attempt to start, the lights dont turn on, horn doesnt work and the starter doesnt do anything. The oil and neutral lights come on but nothing else. i first thought that a power lead was disconnected but all are plugged in unless one is plugged in wrong. Any help will be greatly appreciated any wiring diagrams that are better then the ones in the shop manual that would be great.
thanx

please HELP!