FLC OF ACR LGT ACFT MADE AN APCH WHEN NOT CLRED BY ATC LATE AT NIGHT AT AN UNCTLED ARPT.

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ON APCH INTO PWM (WX 14 BROKEN 7) AT THE END OF A 13 HR CREW DUTY DAY. TWR WAS CLOSED (PAST MIDNIGHT) SO FIELD WAS UNCTLED. WE HAD INTERCEPTED THE LOC TO RWY 11 AND WERE ESTABLISHED INBOUND. 4 RADIO FREQS WERE BEING USED. BOS CTR; CTAF; BGR FSS; COMPANY RAMP. CONFUSION STARTED WHEN I CALLED RAMP FOR A GATE AND CURRENT WINDS. (NO ATIS) RAMP GAVE WINDS OF 200/17 WHICH WAS 180 DEG OFF FROM OUR PREVIOUS RPTED. I RELAYED THIS TO THE CAPT AND THERE WAS CONFUSION AS TO WHICH RWY WOULD BE BEST. I CALLED RAMP AGAIN TO VERIFY THE WINDS AND WAS TOLD THEY WERE 020/17. AT THIS POINT WE WERE INBOUND ON LOC WITH DME AT 4000 FT (CTR ASSIGNED ALT). THE CAPT; UPON RECEIVING THE NEW WINDS; DECIDED TO CONTINUE TO RWY 11. AT THIS POINT THINGS ARE VERY HECTIC WITH THE CAPT MAKING CALLS TO BOS CTR AND CTAF ALMOST SIMULTANEOUSLY. THE FO FLYING THE APCH (IN IMC CONDITIONS) AND ME RUNNING CHKLISTS AND BACKING THEM UP. WE INTERCEPTED THE GS AND STARTED OUR DSCNT OUT OF 4000 FT WITH THE CAPT MAKING CALLS ON CTAF. THINGS WERE CALMING DOWN A LITTLE WITH EVERYTHING GOING SMOOTHLY. ON GS; ON LOC. AT 2600 FT ON OUR DSCNT WE RECEIVED A CALL FROM CTR ASKING US IF WE HAD FIELD IN SIGHT. WE ANSWERED 'NO' AND WE WERE TOLD WE WERE NOT CLRED FOR THE APCH AND WERE SUPPOSED TO BE AT 4000 FT. THE FO THEN ADDED PWR AND ROTATED THE NOSE BACK UP TO 4000 FT. AT 3500 FT IN THE CLB BACK UP CTR TOLD US 'RADAR CONTACT LOST.' AT 4000 FT CTR CLRED US DIRECT THE NDB FOR THE PROCEDURAL TURN ILS APCH. THE FO MADE A TURN TOWARDS THE NEEDLE AND THE CAPT STATED 'DON'T FOLLOW THAT ; IT'S UNRELIABLE. I NEVER GOT AN IDENT.' THE CAPT IS NOW TASK SATURATED TRYING TO KEEP EVERYONE INFORMED OF WHAT WE WERE DOING. SOMEWHERE IN THE CONFUSION WE LOST CONTACT WITH BOS CTR AND WERE UNABLE TO ESTABLISH OURSELVES ON THE ILS WITHOUT THE NDB OR RADAR. AT THIS POINT CONFUSION WAS PREVALENT; WE WERE IN THE WX; WE WERE ALL TIRED; AND WE WERE UNSURE OF OUR EXACT POS RELEVANT TO THE TERRAIN AT OUR ALT. WE ALL DECIDED THAT THE SAFE THING TO DO WOULD BE -- CLB; GET BACK WITH CTR AND GO TO OUR ALTERNATE (BOS) UNDER POSITIVE RADAR CTL. FUEL WAS ALSO A FACTOR. WE HAD ONLY ENOUGH GAS TO SHOOT ONE MORE APCH AT PWN AND MAKE IT TO BOS. SO WITH SAFETY BEING OUR #1 GOAL WE CONTINUED ONTO BOS FOR AN UNEVENTFUL LNDG.