1990 HONDA ACCORD WONT START?

IT STARTED HAPPENIN WHILE DRIVING IT WOULD SHUT OF AND THE ELECRIC SEATBELTS AND RADIO WOULD ALSO GO OFF AND TGE KEY WOULD STILL BE ON THE ON POSITION. THIS HAPPEND A COUPLE TIMES NOW WHEN TRYING TO START CAR NONE OF THE ELECTRICAL STUFF HAS POWER TILL TRYING TO START IT AND IT SOUNDS LIKE IT WANTS TO START MOTOR RUNS FOR LIKE THREE SECOND JUST DONT STAY ON. ANY SUGGESTIONS