SMA TWIN ACFT LOST ELECTRICAL PWR. PLT ELECTED TO LAND AT UNCTLED ARPT AT NIGHT.

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FLYING FROM WICHITA; KS; TO FT LAUDERDALE EXECUTIVE. EVERYTHING NORMAL; CENTER RPTED THEY LOST MY TRANSPONDER; I RECYCLED; CHKED THE CB'S; THOUGHT IT WAS A TRANSPONDER FAILURE. A FEW MINUTES LATER I NOTED THE ENG RPM GAUGES WERE AT 2200 RPM; THEY WERE SET AT 2400 RPM. I PUSHED THE PROP LEVERS TO FULL INCREASE; THE PROPS WENT TO HIGH RPM; STILL INDICATED 2200 RPM; KNEW MY PROBLEM WAS LARGER THAN ON INSTRUMENT. THEN GYRO FLAGS CAME INTO VIEW LIGHTS STARTED DIMMING. CHKING LOADS ON EACH ALTERNATOR; SHOWED ZERO; SUSPECTED DOUBLE ALTERNATOR FAILURE. RADIOS WERE GETTING WEAK; I TOLD CENTER I WAS LOSING COMS; NEEDED A HDG FOR ORLANDO (LESS BUSY THAN TAMPA). CENTER CLRED ME FROM 9 TO 5000 FT. BY THE TIME I WAS AT 5000 FT I WAS IN TOTAL DARKNESS; EVEN THE NAV LIGHTS WERE OUT. I WAS FLYING WITH A FLASHLIGHT ON MY SHOULDER. DURING DSCNT I SAW THE WINTER HAVEN ARPT BEACON WITH THE RWY LIGHTS ON. I WAS FAMILIAR WITH IT BECAUSE MY YOUNGER BROTHER USED TO FLT INSTRUCT THERE. SO I DECIDED THAT LNDG AT AN UNCTLED ARPT WAS SAFER THAN GOING INTO MCO. I THOUGHT THE LIGHT SIGNAL METHOD MIGHT NOT WORK SINCE MY NAV LIGHTS WERE OUT AND THEY COULDN'T SEE ME. I ALSO DIDN'T WANT TO DISRUPT AIRLINE TFC UNNECESSARILY; (I'M AN EX-AIRLINE PLT). SO I LANDED AT WINTER HAVEN; CALLED FSS; ADVISED THEM I WAS ON THE GND SAFE; TOLD THEM WHAT HAPPENED. AFTER LNDG AND INSPECTING THE ENGS I NOTICE THE L ALTERNATOR BELT HAD COME OFF AND THE R ONE WAS VERY LOOSE. I PARKED THE PLANE; SET IN THE BACK; GOT A RENT A CAR AND DROVE THE REST OF THE WAY TO FXE.