Last fall I had a irrigation system that operated perfectly. In November I did a drainage project in my backyard and in the process cut 3 irrigation lines and my 18/8 multi-color low voltage wiring. I repaired the 3 lines. I also purchased a short section of 18/8 wire from my irrigation dealer and spliced it in where I severed the wiring. I used Orbit wire nuts and silicon grease caps. I wired everything up matching each color across the splices. I thought I was in business until I discovered that on my 8 zone system, zone 4 turns on whenever any other zone is on and it won't turn off until I shut the system off at the controller. I've got a pond pump if that matters. While troubleshooting, I disconnected all the wiring for each zone at the Weathermatic SL800 controller. The only wires connected were the red/white wires which come from my Irritrol pump control box and tell the pump to turn on. If with all zones disconnected zone 4 still ran. Somehow it's getting power/water to it even when NONE of the wires for any zone are connected at my controller. I'm at a loss for where to turn and any help would be greatly appreciated. Thank you.