Mine is the same way, I think it's because of the bad GP's that it clicked so much. I have an LED wired to the power side of my controller so I know the plugs are on. when I turn the key, they come on. The WTS light will shut off after 10-15 seconds and I will start the truck but the glow plugs will remain steady/on until about 5 seconds after the truck is running. Sometimes they will pop on again 1 or 2 times after for a second or two.