Ive been checking out the system and the spray motors are working just fine. All lines going to the nozzles appear to be fine with no issues. I did notice theres some wires with a plug going to the nozzles what are those? Do those open and close the nozzles or something? I removed and drained the hoses and tank when I was working on the engine for a few weeks and all plugs and hoses are connected. Any info on these would be great.

Thanks in advance.