I have the CT4, and it has the switch.....
Now let me ask you this. When you look at the switch, is there an electric contact wrapping the inside of the little hole for each setting? On mine, both Nicad and Pb have the metal contact (for the little switch to touch) but the dry option is just an empty plastic hole. Im thinking this might be the issue.....going to try to charge on Pb setting now.
Final question: When I charge, both the red and green lights lightup simultaneous (and stay on continuously) on the side of the flash unit. When the flash did work, the top red light would flash, but now the top red light stays on constantly (when the unit is switched on).
Is this normal behavior?
Also, I have checked the charger to make sure it is on the 120v setting instead of 220.