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I have a 2006 Dodge 2500 (Megacab). The lights (both headlights and interior lights - dash lights, etc.) dim and then become brighter, dim again. Both batteries are new. Could this be an alternator problem? I have had problems before with my TIPM box, could this be associated with that?
 

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Does this happen at all times, or just when the truck is started and not warmed up yet? If it only last for a minute or two at startup, it's your intake grid heater doing it's job.....completely normal.
 
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