How does the switchover valve function? Does it only give 12 volt for 3 seconds? or is the power constant when car is on? I checked, I get 4.9 volt when testing. When I do 12 volt directly, I do hear the click (closes port 3 - is it supposed to close or open port 2?). I did all the testing as you indicated. I just need to understand the function because I am getting conflicting information per diagram and everywhere I have looked.