Originally Posted by crawldaddy
my2000 f250 does the same thing. it will not crank unless you have it plugged up over night. but how can a relay cause the problem when it is cold? seems like to me if a relay is bad the truck shouldnt crank no matter what the temp is, my truck only has 150k on it.
with the glow plug relay out it will start in warm weather as you do not need them but in cold weather you do hence the no start. plugging in the block heater would make it start. just to be clear i'm only explaining this to him i'm not suggesting something you have said so many times. now are you getting any codes?