Appreciate all the replies. Good to know others have observed similar temperature related voltage changes with their alternators. If our alternator voltage does not drop back down to 14.4v when temps warm-up in a week I may very well find we have an electrical and/or battery problem. We'll see.
theoldwizard1, we monitor battery/alternator voltage using our Tekonsha brake controller (displays tenths of a volt). Verified accuracy with a Fluke VM. Been monitoring voltage daily since the truck was new (5 years). Voltage typically hovers around 14.3 - 14.4v about 95% of the time. On occasion charge voltage will drop to 13.9v on a long trip when the batteries get topped-off really well.
