Is it a problem if my glow plug controller doesn't start clicking after the WTS light goes off? It used to.The plugs seem to be working and the WTS light stays on for about 20 seconds. It's hard to tell if everything is as strong as it should be because it's a 30 year old diesel and it's winter in Colorado! Its plugged in at night when I'm home but not when I'm somewhere else. It often takes me a few cycles of glow plugs and cranking if it was cold and the truck wasn't plugged in. I don't know if I'm concerned about that - it used to be better, but it's an old truck, I probably can't expect perfection!