SMA IN IMC HAS ELECTRICAL FAILURE.

Narrative

WHILE ENRTE FROM APC TO SJC ON AN IFR FLT I NOTICED THE LOW VOLTAGE WARNING LIGHT ILLUMINATE. HOWEVER; THE AMMETER SHOWED NO DISCHARGE. I RECYCLED THE MAIN MASTER SWITCH AND THE VOLTAGE LIGHT WENT OUT. I CONTINUED TO WATCH THE AMMETER CAREFULLY. AROUND OAKLAND I RECEIVED THE INSTRUCTION 'FLY HDG 120 DEGS RADAR VECTORS ILS RWY 30L.' WHEN I WAS TOLD TO CONTACT BAY APCH ON 135.40 I CHANGED FREQ BUT COULD NOT MAKE CONTACT WITH THE NEXT CTLR. MY COM RADIOS WERE NOT WORKING; THEN MY NAV RADIOS QUIT; AND THEN THE LORAN. AT THIS POINT I REALIZED THAT I HAD AN ELECTRICAL FAILURE. THE AMMETER STILL SHOWED NO DISCHARGE. I WAS IMC SO I SQUAWKED 7600 AND IN A MATTER OF MINS BROKE OUT INTO VFR CONDITIONS. I HAD CONTINUED TO MAINTAIN 4000 FT AND HDG 120 DEGS; THE LAST INSTRUCTIONS RECEIVED. KNOWING I SHOULD BE NEAR LIVERMORE; I BEGAN TO LOOK FOR IT. I FOUND LIVERMORE ARPT AND CIRCLED DOWN WHILE I PUMPED DOWN MY LNDG GEAR MANUALLY AND LOOKED FOR PATTERN TFC AND WIND CONDITIONS. BECAUSE OF A FOG BANK ON THE N SIDE OF THE RWYS I MADE A L TFC FOR RWY 25R; RECEIVED THE LIGHT GUN SIGNALS; AND LANDED. AFTER LNDG I IMMEDIATELY PHONED BAY TRACON AND LIVERMORE TWR WHO BOTH SAID THAT MY SIT HAD CAUSED NO PROBS AND THEY WERE GLAD THAT I WAS DOWN AND SAFE. LATER WHEN OUR MECHS FIXED THE 210 THEY SAID THAT THE PROB HAD BEEN A FAILURE INFLT OF THE VOLTAGE REGULATOR (ACU) AND ASSOCIATED WIRING. I WAS THE SOLE OCCUPANT DURING THIS INCIDENT.