Well this morning was the second time i had my truck plugged in over night, and this morning when i went to start it i unplugged the truck, got in, let the glow plugs do their thing and waited for the wait to start light to go off. once it did i started to crank it over and it made a ticking sound in sync with the engine cranking. i stopped cranking it and tried it again....same thing. i then decided to keep cranking it for a lot longer than normal and it started up. ran fine. went to the gas station, shut if off went in came out and it started fine no issues. after work the same thing happened, same sounds and no start. cranked it for a while and she fired up. ran fine. could this be glow plug related? relay, switch, what? its starting to get cold where i am at and need this fixed.