05-05-2015, 07:10 AM
Ok seem like your field coil is open or 26B is in backwards or shorted. Measure resistance across 25 by connecting your ohm meter probes to the two + connections of 26. Should show 500 -1000 ohms. If open you'll need to find a replacement speaker. Can use a PM speaker with some minor modification. If 26B was in backwards chuck it and replace with new one. Old one is shorted now.
Terry
Terry