A C172 PLT ON A SIGHTSEEING FLT LOST ALL ELECTRICAL PWR IN THE PATTERN OF HIS HOME ARPT. HE MISTAKENLY FLEW THE WRONG LNDG PATTERN AND CAUSED 2 ACFT TO GAR.

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ON TOURIST FLT IN RENTED C172. VISUAL CONDITIONS ON TRIP FROM KOA HAD BEEN STRESSFUL. CONTACTED HILO APCH ABOUT 15 NM SE. PAX BECAME ILL AND TOOK OFF SEAT BELT. WHEN I CONTACTED HILO TWR; TOLD TO LAND R TFC FOR RWY 8. TOLD TWR I HAD TO CIRCLE WHILE I GOT PAX SETTLED. ALL LIGHTS HAD BEEN ON FOR 2+ HRS. RADIOS BECAME INTERMITTENT. LAST HEARD FROM TWR; I THOUGHT XMISSION SAID; 'WIND SHIFT; DO YOU WANT RWY 21?' THEN I LOST ALL RADIOS; LIGHTS. FUEL GAUGES WENT TO ZERO. WHEN I REALIZED I HAD A COMPLETE ELECTRICAL FAILURE; I WAS WITHIN ATA. APCHED TWR FROM SE; WAGGLED WINGS. COULD NOT SEE A LIGHT GUN. I HAD RUN CHKLIST FOR ELECTRICAL FAILURE AND RECYCLED MASTER -- NO RESULTS; SQUAWKING 7600. FLEW OVER TWR AND MADE R TFC FOR RWY 21. HAD NO FLAPS WHEN I TRIED TO EXTEND THEM. SLOWED DOWN; R TURNS; LANDED ON RWY 21. TWR HAD TO SEND 2 AIRLINERS AROUND WHO WERE APCHING FOR RWY 8. WHEN TWR CALLED ME; THEY TOLD ME I HAD LANDED ON WRONG RWY AND THEY HAD SENT AIRLINERS AROUND. WHEN DISCUSSED WITH TWR CTLR; TOLD ME I SHOULD HAVE FLOWN L PATTERN IF LNDG ON RWY 21. MECHANICAL FACTORS: HAD COMPLETE ELECTRICAL FAILURE. MECH SAID CAUSE WAS OVERLOAD FROM TOO MANY LIGHTS ON FOR TOO LONG. HUMAN FACTORS: 1) TENSE AND FATIGUED FROM POOR VISIBILITY FLT AROUND VOLCANO. 2) PARK NEVER PICKED UP SUBTLE NEGATIVE DEFLECTION OF AMMETER. 3) MISUNDERSTOOD LAST XMISSION FROM TWR. THOUGHT LAST ASSIGNED RWY WAS RWY 21. 4) MY HANDS WERE FULL WITH EMER. 5) COULD HAVE CIRCLED TWR TILL GOT LIGHT GUN. 6) SHOULD HAVE FLOWN STANDARD L-HAND PATTERN; BUT WAS FIXATED ON R PATTERN BECAUSE OF PREVIOUS CLRNC FOR R TFC RWY 8. 7) DISTR BY LOSS OF COM AND LOSS OF FLAPS. BECAME UNSURE OF FUEL STATUS BECAUSE OF LOSS OF GAUGES. 8) SHOULD USE HANDHELD RADIO IF THIS EVER HAPPENS AGAIN.