TA-43 and TA-312 Field phone ringer problem

[elvis3006]

Hi everyone I recently got a set of Army field phones and have a problem with the ringer on one. I hooked up the TA-43 to the TA-312 and at first both ringers worked when cranking on the other. Now the TA-43 ringer will not work when I call from the TA-312. Any old Army Signal Corps gurus out there that can help me trouble shoot this ? Thank you. Rob Oh and the the volumes are cranked up to loud on both.