2003 MERCEDES BENZ SL Electrical System Problems

IGNITION SHUT OFF MULTIPLE TIMES OVER DAYS WHILE DRIVING CUTTING OFF ALL ELECTRICAL RADIO, BRAKES STEERING ETC HAS HAD ELECTRICAL PROBLEMS SINCE 2004 OR 2005 WITH BATTERY SUDDENLY BEING DEAD BOTH ACCESSORY BATTERY IN TRUNK AND STARTING BATTERY AND HAS HAD MANY THOUSANDS OF DOLLARS SPENT ON VARIOUS PARTS AND COMPUTERS THAT WERE SAID TO BE DRAWING DOWN THE BATTERY, ABOUT A YEAR AGO CONTACTED PRESIDENT OF MB NORTH AMERICA AND GOT NO HELP FROM CUSTOMER REP THEN LAST MONTH CAR LEFT ME IN INTERSECTION ONE TIME AND IN EXPRESSWAY ENTRANCE LANE ANOTHER TOTALLY SHUT DOWN ALL ELECTRICAL POWER BRAKES STEERING RADIO LIGHTS ETC AND LUCKILY WASN'T KILLED ALTHOUGH DRIVERS SKIDDED AND BLEW HORN ETC. CAR THEN WOULD THEN CRANK AND FLASH RED EMERGENCY TAKE TO SHOP MESSAGE GOT IT CRANKED AND LIMPED HOME PICKED UP BY DEALER WHO COULD NOT GET IT TO CRANK OR TURN ON ANYTHING ELECTRICAL...