ODBI Code 41

So my heap has been throwing a CEL on cold mornings. Right after I start it up the volts are hanging around 9 and I'll get a CEL. Within a few minutes the volts will jump up to ~14 and if I shut the truck down and restart the CEL will disappear. I pulled the codes and get a "41 Alternator field control circuit open or shorted".
Is this new alt time? Or could it be in the wiring or voltage regulator (which I believe to be part of the ECM)?

brushes might be worn and losing contact in cold weather

I am having the same exact problem. When it got cold around here it started. I checked my battery before starting and it was reading 12.something volts. The guage perks up to 14 something within a minute every morning. It only does it in the morning. I have been driving it all this time (about a month) and it keeps charging. Peak amps was 130 something when I got it parking lot tested at autozone. I am going to just change the alternator out I guess when I have some time off between X-mas and new years. Don't know what else it would be. Probably needs replaced anyhow.

Verify wiring to alternator and grounds. If everything checks out, then the problem is most likely being caused by the alternator. If you buy, go new....not rebuilt or reman.

Similar thread to check out:

http://www.naxja.org/forum/showthread.php?t=1017987

You might just have some dirty connections, your jeep would never start on 9 volts, so for some reason your pcm thinks voltage is lower than it actually is. Also there is a delay in the program for full fielding the alt. and it will limit based on outside temps so the charging system may be operating as designed.

I just changed my alternator yesterday morning and so far the problem is solved. Good luck.

Yeah, I forgot to update. I swapped out the alternator a few days ago. Problem solved. One thing I noticed about the old alt was that the case was cracked through. One whole side had separated.