[T77911S]

my daughters f250 would not start at all last week with this cold spell so I am having to learn diesels and had to break down and work on it in the cold. finally got it started and in the garage thank goodness.
I could not believe it. I measured resistance from the wire for the glow plugs(GP) to ground and it was open. I did not trust what I was seeing as I could not see ALL 8 GP's being bad. so I dove in and pulled all 8. every single one was bad!!
so with all bad and it starting and running fine in "normal weather" I have to assume everything should be good? injectors? air leaks? and so forth.

so is there anything else I should look at while I am working on it?

already cleaned up the battery posts, I am running another ground form the battery directly to the engine and I am going to pull the starter and rebuild that.
trying to get it started it seemed like the batteries ran down pretty fast so I want to clean up the starting circuit.

I have read about injector O rings but from what little I have read they seem to be a pain to pull out and if it has been running good should I mess with it?