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i just got an 01 7.3 and this is my first experience in cold weather with it. It usually turns over about 5 times then fires.
Over the past couple days (being 10-20 deg F and not plugged in) I've had a harder time starting it. I've noticed that after turning over more than 5 times, it turns slower and the bat. gauge drops a bit. On the next crank cycle, volts are back to normal for the first 5 or so turns over, then it drops again. Knowing it takes a certain amount of voltage to 'let' it start, I try not to turn it over much more than 5 or 6 times and concentrate more on heating the glow system.
My batteries are new and even though it slows down if I keep the key turned after the 5-6 times, the next time i try, it spins fast again for the first 5-6 cranks. I did this for about 10 min the other day and even though I thought I was killing the batteries, they held up fine and I got 'er started.
I think next time I'll give it two-three FULL glow cycles (leaving the key on for the full 2 min each time) before I try to crank it.
So, yes, it sounds as though you may need batteries. Also, be sure your running fuel additive and maybe a lighter weight crankcase oil for the cold months. I chose the rotella 5-40 syn for the New England winter. -so far, it's never failed to start (knock on wood)
Hope that helps.