Could be that both cameras have wiring issues under the baseplate, or the microswitch on the shutter release button isn't operating consistently. My last FM2n did at first have issues with the meter turning on. Had to hit it twice, then it came on. Am currently bidding on one that has a supposedly dead meter. As in, completely dead. Essentially is a Nikkormat FS with a smaller body, motor drive coupling, and faster shutter speeds. Will be interesting to see what I discover, if I get it...
-J