1989 FLEETWOOD LIMITED Electrical System Problems

I CAME TO A STOP AT A TRAFFIC LIGHT AND AS I DID SO ALL ELECTRICAL POWER WENT OUT. NO ELECTRIC, NO BRAKE ASSIST. IT TOOK OVER 50 FEET FOR ME TO GET THE MOTOR HOMR TO A STOP. I SLOWLY CAME TO A STOP IN THE INTERSECTION ON A RED LIGHT, THANK GOD THERE WAS LIGHT TRAFFIC. I THEN TRIED STARTING THE MOTOR AND IT DID. AT THE NEXT LIGHT IT DID THE SAME THING. I WAS ABLE TO GET THE VEHICLE STARTED AGAIN AND IT DIED OUT IN THE MIDDLE OF THE NEXT BLOCK. ON REPAIR IT WAS FOUND OUT THAT THE ALTERNATOR WAS NOT PRODUCING ENOUGH ELECTIC AND I WAS RUNNING ON THE BATTERY! WHEN I PUT ON THE BRAKES THERE WAS NOT ENOUGH ELECTRIC TO ACTIVATE THE ASSIST, CAUSING AN OVERLOAD AND KILLING THE SYSTEM. IF I HAD TRIED TO STOP ON THE HIGHWAY AND THIS...