When you get back to the job, a couple of things to try. AC2 is the ground side of the circuit. Did you try going to a known ground instead of AC2 with your meter, if you still don't have a voltage you have eliminated that side of the line and can concentrate on the hot side.When you say you are getting a proper voltage across TSL3 and AC2, you should not read a voltage there unless you are reading from the AC1 side of the circuit to them. If you are reading a voltage across TSL3 and AC2 that is showing an open circuit there.