AN SMT ATX PLT LOSES HIS ELECTRICAL PWR DEPARTING SEA AREA AND CLBS THROUGH A VFR HOLE TO CONTINUE VFR ON TOP TO DEST ARPT. PWR WAS TEMPORARILY RESTORED FOR HIS ARR AT DEST.

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AFTER DEPARTING BFI ON KENT 3 DEP; WAS ASSIGNED 4000 FT THEN SHORTLY AFTER; 5000 FT. UPON APCHING 5000 FT; CTLR RPTED NOT RECEIVING MODE C AND ASSIGNED FILED ALT 9000 FT. I RPTED BACK LEAVING 5000 FT FOR 9000 FT. DURING THE CLB; COMS BECAME DIFFICULT AND RADIO PROBS WERE EVIDENT. ATC ASKED WHAT ALT I WAS AT AND I RPTED OUT OF 8200 FT FOR 9000 FT. THE DISPLAY LIGHTS BEGAN TO FLASH INTERMITTENTLY AND CONFIRMED A PROB WITH THE ACFT RADIOS. NEXT I NOTICED A FUEL BOOST INOP LIGHT ILLUMINATE AND SWITCHED TANKS; WHICH NORMALLY RESULTS IN THE LIGHT GOING OUT; BUT IT REMAINED ON AND I BECAME AWARE OF THE PROB NOT BEING LIMITED TO THE RADIOS. I BEGAN REDUCING THE ELECTRICAL LOAD; IE; PITOT; PROP AND WINDSHIELD HEAT OFF. AS I APCHED 9000 FT; I COULD SEE A HOLE OF BLUE SKY JUST TO MY R; AND I TURNED RIGHT FOR IT; AS IT SEEMED TO BE THE BEST ALTERNATIVE. BOTH NAVS WERE FLAGGED. I BROKE OUT ON TOP AT ABOUT 9500 FT AND CONTINUED MY CLB. AS I BROKE OUT; A HVY JET PASSED OVERHEAD. IT APPEARED TO BE APPROX 1000-1500 FT ABOVE ME. I CONSIDERED REVERSING MY COURSE AND ACTUALLY DID TURN AROUND TO RETURN AND LAND BUT WAS NOT COMFORTABLE WITH THE SIT CONSIDERING TFC DENSITY AND WX BECAUSE I HAD BEEN IFR. (I HAD PREVIOUSLY; PRIOR TO REACHING 9000 FT; REQUESTED TO TURN AROUND AND GET CLRNC BACK TO BFI; NOT KNOWING WHERE THE TOPS WERE.) I DECIDED TO CONTINUE VFR EBOUND AND CLBED TO 11500 FT; THEN TO 12000 FT AS THE TOPS WERE HIGHER TO THE E OVER THE CASCADES. I SQUAWKED 7600 AND ATTEMPTED TO RESTORE PWR. I WAS UNSUCCESSFUL AT DOING SO USING THE CHKLIST FOR ALTERNATOR INOP (ALTERNATOR LIGHT ON). I USED IT EVEN THOUGH THERE WERE NO ALTERNATOR LIGHTS ON. CYCLING THE MASTER SWITCH AND ALTERNATOR SWITCHES DID NOTHING; SO I SHUT THE ELECTRICAL SYS DOWN AND CONTINUED TO MY DEST APPROX 60 NM VFR. UPON REACHING MY DEST; I PWRED THE ELECTRICAL SYS AND LOWERED THE GEAR AND FLAPS NORMALLY AND ANNOUNCED ON TA FREQ UNEVENTFULLY. WHEN I WAS TROUBLESHOOTING THE SYS AND RECYCLING THE SWITCHES I MAY HAVE TRIED TO DO THIS TOO QUICKLY WITH THE STRESS OF THE SIT. I DID KNOW THAT WHEN I SAW BLUE SKY I WANTED TO GET TO VFR IMMEDIATELY AND AM GLAD I DID. USING THE COMPASS (HSI HDG INFO ELECTRIC) ALTHOUGH WAS BRIEF; WAS VERY DIFFICULT AND HAD NO PRACTICE WITH IT FOR 3 YRS. I DID NOT REALIZE IT AT THE TIME; BUT ON THE R SIDE (COPLT) THERE WAS A HORIZ INDICATOR DRIVEN BY VACUUM. THIS IS A PROB WHEN THE ACFT YOU FLY ARE NOT STANDARDIZED. BY THE TIME I MADE IT OUT ON TOP I DID NOT KNOW WHICH DIRECTION I WAS GOING. ALL I WAS FOCUSED ON AT THAT TIME WAS GETTING THROUGH THE HAZE IN THE CLOUDS. UPON LNDG; I NOTICED THE OVER VOLTAGE RELAY CIRCUIT BREAKERS OPEN WHICH WAS NOT ON THE CHKLIST TO CHK BUT I THINK IT WAS CLOSED WHEN I LOOKED. AFTER THE INCIDENT OCCURRED INITIALLY I REMEMBER LOOKING AND NOT SEEING ANY OPEN BREAKER SO DON'T KNOW IF IT OCCURRED BEFORE LNDG WHEN I REPWRED THE SYS; OR POSSIBLY WHEN I SHUT THE SYS DOWN AND PULLED THEM.