AN SMA PLT HAD AN ALTERNATOR FAILURE. BOTH MAIN GEAR COLLAPSED ON LNDG.

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ON JAN/THU/93; I DEPARTED BOWMAN FIELD AT XA30 PM; TO OWENSBORO; KY; ON AN IFR FLT PLAN OPERATING UNDER PART 91. CLBING OUT; I RAISED THE GEAR AND THEN THE FLAPS. UPON REACHING 300 FT AGL; ALL LIGHTS WENT OUT. I IMMEDIATELY XMITTED MY INTENTIONS AND MADE A L TURN TO STAY IN THE TFC PATTERN. NO ACKNOWLEDGEMENT OF MY XMISSIONS WERE RECEIVED. I TURNED OFF THE MASTER SWITCH AND CHKED ALL OF THE FUSES; WHICH WERE ALL IN POS; AND RESET THE MASTER SWITCH. THE RADIO LED'S WERE SHOWING SOME LIGHT BUT NO COMPLETE NUMBERS. I PUT THE GEAR POS HANDLE IN THE DOWN POS ON DOWNWIND. I HEARD THE GEAR MOTOR; LOOKED OUT MY WINDOW AND SAW A WHEEL IN THE NORMAL DOWN POS. I THEN LOWERED THE FLAPS TO 30 DEGS. THE FLAPS DID EXTEND. MY BACK SEAT PAX THEN HANDED ME A HAND HELD RADIO ON WHICH I ANNOUNCED THAT I WAS GOING TO LAND ON RWY 24. I DID HAVE PARTIAL ELECTRICAL PWR AS THE ELECTRIC MOTORS FOR BOTH THE GEAR AND THE FLAPS DID WORK. THE WARNING LIGHT FOR THE ALTERNATOR WAS NEVER ON. AT NO TIME DURING THE APCH DID THE AURAL WARNING FOR THE LNDG GEAR SOUND. THE FLAPS WERE FULLY EXTENDED AND I BELIEVED THE LNDG GEAR TO BE DOWN AND LOCKED. TOUCHDOWN SEEMED NORMAL AT FIRST; THEN A SIDE-TO-SIDE WADDLE TYPE MOTION WAS ENCOUNTERED AS THE ACFT SETTLED ONTO THE RWY. I THEN SECURED AND EXITED THE ACFT. THE TWR WAS CONTACTED ONCE WE WERE CLR OF THE ACFT VIA THE HAND HELD RADIO. BOTH MAIN GEAR HAD FOLDED UNDER THE FUSELAGE; HOWEVER; THE NOSE GEAR WAS DOWN AND LOCKED. THE WX WAS IFR DUE TO CEILINGS AND THERE WERE ACFT ON INST APCHS TO BOWMAN; I BELIEVED THAT I HAD THE ACFT IN A SAFE LNDG CONFIGN. DUE TO THE WX CONDITIONS AND TO THE FACT THAT I WAS INVISIBLE TO THE OTHER ACFT IN THE IMMEDIATE VICINITY; I BELIEVED I SHOULD GET THE ACFT ON THE GND AS SOON AS POSSIBLE RATHER THAN RISKING THE LIVES OF MY PAX; THE PAX IN OTHER ACFT IN THE AREA AND PEOPLE ON THE GND BY SPENDING MORE TIME DIAGNOSING THE PROB IN THE AIR.