I have a '08 6.7 and when i start my truck i notice if i have the interior light on, that it dims/gets brighter. Is someting at startup drawing a lot of power or do i have some sort of alternator/battery problem.

Thanks

 

Your starter is a drawing a lot of power when it cranks the engine over.

 

no i should have specified, it happens after is started and is idling. but within the first 5 minutes of idling after that the flickering goes away.

 

I'd get your altenator tested also check your battery as well. Something isn't right

 

Ditto, sounds like the alternater is hunting.