At least the second controller is 24 VAC, I am not positive about the first and forgot to ask about that. If it is also 24 VAC, then that is good.
I am confused by the following two statements that seem to conflict with each other. I presume the ‘A’ and ‘B’ correspond to the labels on the pictures?
- four wires connected (2 not connected) on ‘A’
- 12 wires connected on ‘B’
If some of the wires are hooked up, but not going to a valve, I probably would not connect when just in case they touched the common wire somehow and the zone was accidentally turned on.
The question that @wpd84 posed about any “trick circuits” might be important. Please do make a map of each ZONE (not necessarily each sprinkler although that might help you in the future). We want to make sure one valve exists on each wire with nothing tricky done. It seems unlikely, but want to make sure. That is why I asked, how many valves do you have?