On the 2000 and probably the 2001 trucks, the alternators are kept off until the assorted heaters come up to temp. In my truck that means you are running off the batteries for a full 5 minutes after start, so good batteries are essential in addition to cold start capabilities. You'll know it's time to do something when performance degrades to one crank session unless you like jumping. Really cold means sometimes cycling the key to get the glowplugs and fuel heaters going a couple of times. Btw the block heater needs heavy duty extension cords unless you like house and truck fires.
You'll like FORscan, my version had suggested items to check for code issues
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