[Dave Moll]

Looking at your image, I note that your line cord uses a colour convention with which I am not familiar.

For your wiring to work, you need to ensure the line is connected across T1 (A leg) and T8 (B leg).

If using the internal bell capacitor, then T8 and T9 should be strapped (as they appear to be in your image).

If using a third (bell) wire from a master socket, either the strap between T8 and T9 or that between T10 and T11 need to be removed (to disconnect the internal capacitor) and the third (ring) wire needs to be connected to T11/T12.

Given the above,
red needs to be the A leg (furthest pin of BT plug from the locking clip)
green needs to be the B leg (nearest pin to clip)
and yellow needs to be the ring wire (next pin to above)
(I am assuming four pins in the plug. If there are six, then ignore the outer two.)