My truck was a ***** to start even before the weather turned cold with new 60 glow plugs; cranking for 5-10 secs and clouds of white smoke. Installed relay kit from ssdiesel and the extra time does the trick. I hit the switch now for 10-15 secs with the ignition off (no DRL headlights adding drain) then hit the starter. Starts real good every time. Those ac60s definitely need more time than the computer will allow. What a difference!!