Where does the white wire come from? In a normal 500 set, the white switch hook lead should be on terminal F with a green wire from the dial. Are you sure that the wire on terminal K is really white? The older ringer coils had a solid slate wire that often appeared to be white.

The only other white wires would be from the dial and there are two of them: One should be on terminal R and the other on terminal GN.


Ed Vaughn, MBSWWYPBX