C172 CFI ON A TRAINING FLT LOSES OR HAS A PRIMARY ELECTRICAL PWR SUPPLY PROB; BECOMES A NORDO ACFT AND PERFORMS AN UNAUTH PENETRATION OF AIRSPACE TCA B AT STL. CONTINUES TO DEST ARPT UNDER IFR USING PILOTAGE.

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AT THE LOCATION STATED ABOVE WE HAD JUST GOTTEN OUR IFR CLRNC FROM ZKC. CTR ASKED US TO IDENT OUR XPONDER; SO WE DID. ZKC THEN SAID THEY WERE GOING TO GIVE US VECTORS TO FTZ VOR AND TO EXPECT DIRECT UIN AFTER THAT. WE FLEW THE HDG GIVEN TO US BY CTR. AFTER THAT WE COULD STILL HEAR CTR BUT THEY WOULD NOT RESPOND TO ANY OF OUR CALLS. THEN WE HEARD CTR TELL US TO CHANGE FREQ TO ANOTHER KANSAS CITY FREQ. WE REPEATED THE FREQ BUT THEY DID NOT RESPOND. SO WE CHANGED FREQ IN OUR RADIO AS INSTRUCTED; BUT STILL NO RESPONSE FROM ZKC. NOTE: WE COULD STILL AT THIS TIME HEAR THEIR COM WITH OTHER AREA TFC. AT THIS TIME WE NOTICED OUR NAVAID WAS NOT ACCURATE ACCORDING TO GND REF POINTS. WE WERE LOCATED S OF STL BUT OUR NAVAIDS WERE TUNED TO FTZ WITH 330 DEGS IN TOP OF THE VOR AND THE NEEDLE WAS DEFLECTED R (EXACTLY OPPOSITE OF WHERE IT SHOULD OF BEEN POINTED WITH A 'TO' INDICATION). WE TRIED CONTACTING ZKC ON VARIOUS FREQS AS WELL AS FLT WATCH AND STL RADIO BUT NEITHER COM #1 NOR COM #2 WAS XMITTING. WE; AT THAT TIME; SHUT DOWN ALL ELECTRIC EQUIP EXCEPT COM #1; ALTHOUGH WE WERE LOSING OUR ABILITY TO HEAR ANYTHING. WE PUT 7600 IN THE XPONDER. WE USED THE COMPASS AND HDG INDICATOR TO FLY 270 DEGS. THEN WE TURNED 360 DEGS JUST W OF SPIRIT OF ST LOUIS ARPT IN AN EFFORT TO GET OUT OF THE STL CLASS B AIRSPACE. THEN WE FLEW NE UNTIL WE FOUND HWY 61 AND THE MISSISSIPPI RIVER WHICH WE FOLLOWED TO QUINCY; IL; REMAINING VFR THE WHOLE TIME. WE LANDED AT QUINCY AND IMMEDIATELY CALLED 1-800-WX-BRIEF CANCELING OUR IFR FLT PLAN AND EXPLAINED IN BRIEF OUR LOSS OF ALL ELECTRICAL PWR. EVERYTHING WORKED OUT OK; ALTHOUGH I DID NOT UNDERSTAND WHY ZKC DID NOT TRY TO COMMUNICATE WITH ME DURING THE TIME THAT I COULD STILL HEAR THEM BUT; EVEN THOUGH THEY COULD NOT OBVIOUSLY HEAR ME. WE CHOSE TO LAND IN QUINCY BECAUSE IT WAS AWAY FROM THE CONGESTION AT STL.