PLT OF AN SMA SEL MADE AN EMER FORCED LNDG AFTER SMELLING SMOKE AND LOSING ALL ELECTRICAL DUE TO FAILURE OF THE ENG ALTERNATOR.

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ELECTRICAL/ALTERNATOR FAILURE. ON PREFLT; THE ALTERNATOR BELT WAS FINE; ALTHOUGH THERE WAS SOME OIL ON THE COWLING. THE LCL MECH AT TEB SAID IT WAS FROM MESSY OIL CHANGES. THE ALTERNATOR CHKED OUT ON RUNUP; ALTHOUGH THERE WAS A MUSTY SMELL IN THE CABIN. WHEN ABEAM SWF; THE AUTOPLT STARTED TO BLINK. I PULLED THE AUTOPLT CIRCUIT BREAKER. A SCREAMING SOUND CAME OVER THE RADIO; WHICH TURNED OUT TO BE THE ROTATING TAIL BEACON; SO I SHUT IT OFF. ALTHOUGH AT NO TIME DURING MY SCAN DID I NOTICE THE ANNUNCIATOR LIGHT GO ON; I SAW THE AMMETER INDICATE NO LOAD. I PERFORMED THE ITEMS IN THE ALTERNATOR-OUT CHKLIST; AND DECIDED THAT THE ALTERNATOR HAD FAILED. IN THE NEXT 10 SECONDS THE #1 NAV RADIO FAILED; THE #2 NAV RADIO FAILED; FOLLOWED BY BOTH COM RADIOS. I IMMEDIATELY SET 7600 ON THE XPONDER; WHICH FAILED 2 SECONDS LATER. ALL OF THE ABOVE EVENTS TOOK PLACE IN LESS THAN 2 MINS. AT THIS POINT I WAS LESS THAN 2 MI N OF STEWART ARPT AT 3500 FT; WITHIN GLIDING DISTANCE. THE AIRPLANE SMELLED MUSTY; AND I WAS HAVING SECOND THOUGHTS ABOUT THE OIL I HAD SPOTTED EARLIER. SINCE THE ANNUNCIATOR PANEL NEVER INDICATED ANYTHING; I WASN'T SURE IF IT WAS ONLY AN ALTERNATOR PROB. SINCE IT MIGHT HAVE BEEN AN ELECTRICAL FIRE; I DECIDED TO LAND AT SWF. I HAD A HAND-HELD RECEIVER (ONLY) AND MONITORED THE CTL TWR FREQ. I DSNDED SBOUND INTO SWF'S AIRSPACE AT 2900 FT AND TURNED WBOUND WHEN 1/2 MI N OF RWY 27. WHEN ABEAM THE NUMBERS OF RWY 9; I TURNED S. THERE WERE STILL NO RADIO COMS OR LIGHT SIGNALS FROM THE TWR; SO I DECIDED TO LAND INTO THE SLIGHT WINDS FAVORING RWY 34. I THEN DSNDED TO TFC PATTERN ALT; TURNED ONTO FINAL AND LANDED. I SAW NO LIGHT SIGNALS AFTER I LANDED WHILE I MONITORED THE GND CTL FREQ. AGAIN; NOTHING FROM THE TWR; SO I TAXIED TO THE LCL FBO TO CALL THE TWR ON THE PHONE IMMEDIATELY. I SPOKE TO THE TWR; THE LCL LAW ENFORCEMENT OFFICIALS; AND THE FAA AND TOLD THEM WHAT HAPPENED. IF I COULD HAVE REPLAYED THE INCIDENT; I WOULD HAVE DONE 2 THINGS DIFFERENTLY. FIRST; IT TURNS OUT SWF'S 'CALM WIND RWY' IS RWY 27; SO I LANDED ON THE WRONG RWY. ON THE PHONE THE TWR TOLD ME THEY DID NOT SEE ME UNTIL I HAD BEGUN TO TAXI TOWARD THE RAMP. SECOND; I SHOULD HAVE HAD MORE FAITH IN MY PREFLT CHKOUT; WHICH IS ALWAYS QUITE THOROUGH. IN RETROSPECT; I COULD HAVE TAKEN THE EXTRA 5 MINS TO LAND AT SNA; A NEARBY UNCTLED FIELD. BUT AT THE TIME I DIDN'T WANT TO END UP AS ANOTHER STATISTIC IN A NTSB ACCIDENT RPT. IT TURNED OUT THE MUSTY SMELL MIGHT HAVE COME FROM A CIGAR WHICH I FOUND IN THE CABIN. I HAVE TAKEN ONE FURTHER PRECAUTION TO AVOID THIS INCIDENT IN THE FUTURE: I PURCHASED A HAND- HELD TRANSCEIVER.