SINGLE PLT IFR HAD OVERLOAD OF ALTERNATOR; LOST RADIO COM; RESORTED TO HAND HELD EMER AND CHANGED TWR FREQ WITHOUT CLRNC.

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ON A 2-DAY TRIP FROM 6R0 TO BFI IN SMA ACFT; GOT BRIEFING FSS DAY BEFORE TRIP LEG GTF-GEG. MORNING OF TRIP LEG GTF- GEG; AND 40 MINS BEFORE TKOF FROM GTF. SUPPOSED TO BE VFR; NOTICING SMOOTH. AT 14000 MSL PICKED UP ICING IN AREA OF FOG OVER ROCKY MOUNTAINS. IMMEDIATELY REQUESTED PERMISSION TO CLB BUT BY THE TIME GOT PERMISSION TO CLB HAD 1/4 INCH ICE ON LEADING EDGE OF WING AND COULD NOT CLB. GOT OUT OF FOG AREA IN 10 MINS OR LESS AND ICE MELTED OFF ON DSCNT TO BFI ARPT. ON APCH BFI ALTERNATOR OVERLOADED DUE TO USE OF ALL ELECTRICAL GEAR; STORM SCOPE; LNDG LIGHTS; PITOT HEAT AND STROBES. TOLD SEATTLE APCH OF PROBLEM; SHUT ALL ELECTRICAL DOWN EXCEPT 1 NAV/COM GS; MARKER BEACON; AND TRANSPONDER. ATTEMPTED MULTIPLE RESETTING CIRCUIT BREAKERS; ETC WHILE VECTORS FOR ILS 31R APCH BFI. SEATTLE APCH HELPED EXPEDITE MY LNDG. ON 2 MI FINAL RADIO BEGINS TO FADE OUT DUE TO LOW BATTERY. I GRABBED MY HAND-HELD AND PLUGGED TO EMER ANTENNA ON OUTSIDE AIRPLANE; LANDED BFI. TWR SAID TO TURN L ON NEXT EXIT AT PARALLEL RWYS AT BFI. I EXITED OFF 31R AND SWITCHED TO HAND-HELD. DISPLAY LIGHTS ON NAV/COM IS ELECTRICAL GAS DISPLAY WHICH FADED OFF DUE ELECTRICAL INTERRUPTION. I PUNCHED IN GND FREQ ON HAND-HELD RADIO AND REPEATED LAST CLRNC TO TAXI ON GND FREQ I GOT FROM LOOKING ON MY APCH PLATE. I WAS TOLD TO STAY WITH TWR FREQ PREVIOUSLY BUT I HURRIEDLY HAD PUNCHED IN GND FREQ OUT OF HABIT. WHEN I TURNED OFF RWY AND WAS STOPPED OFF RWY TO TURN ON; SET SQUELCH VOLUME AND PUNCHED IN KEYBOARD FREQ ON EMER HAND-HELD RADIO. GND CTL GAVE CLRNC TO TAXI; TOLD ME I WAS TO STAY ON TWR FREQ AND SHOULD NOT HAVE CHANGED FREQ. I MADE ERROR DUE TO PREVIOUS TURB PROBLEMS; ICING PROBLEMS; ALTERNATOR DISCHARGE ELECTRICAL PROBLEMS; RADIO FAILURE AND IN HASTE TO USE HAND-HELD RADIO.