LOSS OF PRIMARY ELECTRICAL PWR SUPPLY RESULTS IN INSTRUCTOR STUDENT PLT EXECUTING LOS COM PROC DURING IMC IAP ILS APCH.

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MY STUDENT AGAIN IDENTED BOTH NAVAIDS; PICKED UP THE GS; AND FOLLOWED IT DOWN. 3 MI FROM THE RWY; OUR GS FLAG CAME ON; AT WHICH TIME I TOLD STUDENT TO FLY THE #2 VOR WHICH WAS SET ON THE VOR 18 APCH COURSE. I IMMEDIATELY CALLED MADISON TWR AND TOLD THEM THAT THE ILS 18 WAS OFF THE AIR. APPARENTLY THEY DIDN'T GET MY MESSAGE. AFTER TALKING TO THEM AFTERWARDS THEY APPARENTLY NOTICED A PROB AT THIS TIME WITH OUR XPONDER GOING OFF THE AIR 3 MI OUT. I ALSO NOTICED THE RADIOS BOTH COM AND NAV #1 AND #2 BLINKING AS WELL AS OUR DME AND LORAN. I TRIED CALLING MSN TWR AGAIN WHILE CHKING THE ALTERNATOR OUTPUT WHICH SHOWED A LITTLE BELOW 35 AMPS. WHILE ALL THIS OCCURRED; I HIT THE RADIO MASTER ON AND OFF; THEN BACK ON. STUDENT PLT AT THIS TIME HAD DSNDED OUT OF THE CLOUDS ABOUT 1/2 MI FROM THE END OF RWY 18. I THEN TOOK THE ACFT CTLS AND CIRCLED TO LAND ON RWY 13 SINCE 18 WAS CLOSED. I LANDED AND TURNED OFF ON THE FIRST TXWY AND HELD BEHIND THE YELLOW LINE. AFTER 5- 10 MINS WE FINALLY GOT COM #2 TO WORK. WE CALLED MSN TWR WHICH TOLD US TO TAXI TO THE RAMP. I SECURED THE ACFT AND THEN CALLED MSN TWR BY TELEPHONE AND TOLD THEM WHAT HAPPENED. I WAS INSTRUCTED THAT EVERYTHING WAS FINE. I FEEL THAT MY ACTIONS WERE APPROPRIATE. I KNOW THAT WX CONDITIONS WERE LOW THAT DAY AND OUR LEGAL ALTERNATE WAS LOW AND IFR AS WELL THE ONLY AND CLOSEST VFR ARPT WAS SUX BUT HOW WERE WE TO NAV THERE IN IFR WITH NO NAV OR COM. THE ONLY CORRECTIVE ACTION I DIDN'T MAKE WAS TO HIT THE ALTERNATE BUS SWITCH WHICH I DIDN'T DO SINCE ALL THIS TOOK LESS THAN 2 MINS. I FEEL THAT WE DID THE RIGHT THINGS IN HANDLING THIS SERIOUS SIT. I BELIEVE IN TRAINING IN LOWER CONDITIONS WITH MY STUDENTS. THE LESSON HERE IS TO KNOW YOUR OUTS AND KNOW THE ACFT WELL THAT YOU FLY!