BE36 PLT EXECUTES NO-GYRO APCH FOLLOWING ALTERNATOR FAILURE.

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ON JUL/SUN/02; WHILE ON AN IFR FLT PLAN FROM OSH TO SMQ IN THE VICINITY OF JOHNSTOWN; PA; I EXPERIENCED AN ELECTRICAL FAILURE (ALTERNATOR) WHILE IN SOLID IMC AT 9000 FT. ZNY CTLRS WERE VERY HELPFUL IN DECLARING AN EMER FOR ME AS IT WAS DIFFICULT HOLDING HDG AS HSI WAS ELECTRIC. ACFT WAS EQUIPPED WITH A STANDBY ALTERNATOR BUT; WHEN PWRED UP; IT DID NOT PWR THE HSI! DURING THIS PERIOD; ALT DROPPED A TOTAL OF 1000 FT; DOWN TO 8000 FT MSTL AND HDG VARIED 60 DEGS. CTL WAS RESTORED BY START TURN; STOP TURN AND DSCNT TO ZZZ ARPT ILS RWY 13 WHICH I HAD PRACTICED MANY TIMES. A PARTIAL PANEL ILS APCH WAS EXECUTED UNDER VERY STRESSFUL CONDITIONS BREAKING OUT AT FT. NUMEROUS ALT AND HDG DEVS OCCURRED WHILE BEING VECTORED TO THE LOC COURSE BY THE CTLRS. THE EVENT ENDED WITH A NORMAL LNDG ON RWY 13 AT ZZZ. THE SUGGESTION IS THAT THE STANDBY ALTERNATOR SYS SUPPLIED BY BEECHCRAFT IS INADEQUATE AS IT IS 'HARD WIRED' TO PWR CERTAIN ACCESSORIES AND NOT THE HSI. THE HIS; I BELIEVE; IS KEY IN SUCH A STRESSFUL SIT AND IS BETTER THAN RELYING ON A WET COMPASS IN IMC AND TURB IN THE DSCNT. OTHER STANDBY SYS PWR THE HSI BUT THE OEM BEECH SYS DOES NOT. THIS NEEDS TO BE CORRECTED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR'S HORIZON AND VERT SPD INSTS WERE FUNCTIONING NORMALLY BUT HE FIXATED ON THE LOSS OF THE PRIMARY HDG INDICATOR AND; THEREFORE; DID NOT USE HIS HORIZON AND VSI TO MAINTAIN PROPER ATTITUDE INITIALLY. HE STATED THAT HE WILL BE GETTING ADDITIONAL PROFICIENCY TRAINING. RPTR STATES THAT HE HAS LEARNED OF AN AFTER-MARKET STC'ED STANDBY ALTERNATOR THAT CAN BE CONNECTED TO THE PRIMARY AC BUS RATHER THAN THE EMER ELECTRICAL BUS AND WHICH CAN BE WIRED TO PWR ANY ITEMS WHICH THE PLT WANTS ON STANDBY PWR.