When I start my truck in the morning the voltage has been going up and down and the lights dim with it. I just replaced the battery, does that have anything to do with it?

 

Where do you live? If its cold its probably just your heater grids cycling until the intake reaches a certain temp. Mine does it for about 2 miles goes to work inthe mornings.

 

i live in arizona. its cold in the mornings right now but not that cold. My truck died the other dsy while i was driving also. im wondering if my battery cables are jacked?

 

I believe it only needs to be below about 60 degrees for your grid heater to start cycling. If it's only doing it after start up in the morning, or after the truck has sat all day, and it goes away in a couple miles, it's the grid heater. If it does it all day, I would think you have a grounding, or voltage regulator issue.

 

These threads are staring kinda late this year, usually they start in September.

It's just the grid heaters cycling, totally normal. Like gear jammer said, it's only got to get below 60 degrees for them to start working.