I've been noticing my truck has been doing something a little odd. Normally when I drive it, the voltage meter on the dash points to 14 or below- right in the middle of the guage. Now it is between 14-16 and stays up that high even after an hour or so of driving. Is it charging more because it's very cold out, or could my battery possibly be going? It doesn't have any real trouble starting, but I don't want to wake up one day and have it dead. Let me know if it's normal or if I should have it checked. Thanks!