My plow is 20 years old but very well taken care of and maintained. I plow with an 82 HP full cab Kubota tractor. This year when I mounted the plow and plugged in the battery connector the pump immediately came on and the plow powered up and the pump continued to run. This all took place with out the control block connected. I've replace the solenoid and traced wires but the problem continues. Can anyone tell me what's going on and a solution.