classic motorcycle forum

Hey I was riding my 81 yamaha xj650 when it all of a sudden lost all power when i stopped at a stop sign.  I tried putting it back in neutral but with the key on there was no power getting to anything.   I checked the fuses under the seat and the connections but i can't find anything obvious.  Even with a battery charger nothing will come on.  I dont know much about electrical systems on bikes.  Does anyone have any ideas??  i'm stumped.. thanks