[trentonbaxter]

I have an 06 2500 mega cab. When I first start it up it will do fine then all of a sudden it's like one of the batteries quits working. The dash lights and the headlights will fade some. And the battery gauge will also go down. I test the connection and both connections looked clean. One was loose and I tightened it. That didn't solve it. I was wondering if one if my battery's is going out or if it's something else. If I drive it for a while it won't do it it only occurs when I first start it up.

 

[maxxram]

Sounds like it could be the grid heater cycling. When temps get low the grid heater will cycle for a little. Here is the sticky on it. http://www.cumminsforum.com/forum/3rd-gen-powertrain/317216-headlights-dimming-then-going-bright-again.html

 

[trentonbaxter]

Yeah the cooler weather just started coming in so that's probably it thanks

 

[mtnrider]

Grid heater cycling. Perfectly normal in cooler weather.