[Super Kaz]

For about ten minutes or so after I started my truck today the headlights and gauge lights kept going dim. It does about every 30 sec for about 5 seconds or so, only when I driving. I have a digital volt meter in the truck and it reads 14.1v at idle, 14.2v when driving and drops to 12.5 when the lights diim. Its been doing it on and off for about a week. Might do it all the time and I don't notice, I don't alway drive at night. Anyone else seen this. Do you think the alt and going out? It is a dual alt, what is the chance that both are going out? I getting ready to head to texas this week (1100 miles each way) and am a little worried about it.