RPTR HAS ELECTRICAL PROBS CAUSING RADIO COM AND NAV PROBS AFTER CANCELING IFR IN MARGINAL CONDITIONS. RPTR DECLARES AN EMER SQUAWKING 7700 AND GOES IMC.

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HDG 350 DEGS; 8000 FT; S OF HRS. FAMILIAR BROKEN CUMULUS WITH SMALL SCUD BELOW FOR THE PAST 30 MI; FREQUENT GND CONTACT. CANCELED IFR TO LOOK FOR HOLES OVER LAKES/46A. NO BUILD-UPS IN SIGHT; EVERYTHING SEEMED NORMAL; EXCEPT LAST 2 HDOFS WERE LATE. PERHAPS THAT WAS THE FIRST SIGN OF THE PROBS TO COME. CALLED (JAX/ATL) TWICE ABOUT WHO I SHOULD BE TALKING TO. WENT DOWN THROUGH THE BROKEN LAYER (FIRST MISTAKE); TO 6000 FT TO FIND THE EXPECTED THIN SCATTERED LAYER OF SCUD AT 3000-4000 FT IN FOG. TURNED W TOWARD HRS AND THE ARPT (SECOND MISTAKE); WHICH BROUGHT ME UNDER A SOLID OVCST AND WORSENING GND CONTACT. THE TRAP WAS SPRUNG. TURB AND DRIVING RAIN CAME SUDDENLY; GIVING ALL A VERY BAD TIME. DIDN'T DARE ATTEMPT A TURN SO CALLED FOR CLRNC; CLBED IN HVY RAIN AND WIND; AND PROCEEDED TO CHA WITH A NOW-SLUGGISH VOR NEEDLE. SOON AFTER SWITCHING TO CHA APCH; LORAN WENT RED. DIDN'T HEAR EXPECTED COURSE/ALT CHANGES; CALLED APCH AND FOUND RADIOS DEAD. SQUAWKED 7700 FOR 1 MIN AND FORGOT IT IN THE ENSUING FLAP OF IMPENDING COMPLETE RADIO/NAV FAILURE. CONTINUED ON; HOPING THE HALF DEAD NAV COULD FIND CHA. IT COULDN'T. TURNED N; TO KEEP OUT OF THE CITY AND APCHS TO THE S; WHERE I COULD DSND IN THE VALLEY. FLAGS JUMPED; GND AND RIVER WERE VISIBLE AGAIN SO WE WENT DOWN; GOT LOCATED AND HEADED FOR CHA USING AN UNFAMILIAR NEW GPS. ENRTE; SAW DAYTON AND LANDED. PAX ILL AND SHAKEN; PLT EXHAUSTED AND CONTRITE FOR MESSING UP AIRSPACE AND PLACING PAX IN WHAT COULD HAVE BEEN A DISASTER SIT. EVEN FAMILIAR MARGINAL WX CAN BE A TRAP!!