2 years 11 months in your environment you have nothing to complain about.
Keep in mind as the engine ages it becomes harder to start.
The truck requires more power to start as it ages. The power required Year 1 to start the truck with a new battery is less than the power required to get things going in year 6.
As the engine continues to age and becomes harder to start the batteries gets weaker.
For the record my 2007 LBZ required new batteries every 2 years or so.
I was told to use Delco's. They lasted 2 years or so and cost $160.00 each or so.
So if you know of a way to get 3 years plus out of 2 diesel batteries let us know.:@
Yes you should change both batteries. Changing only one gives you a 50/50 shot the next time it doesn't start.
To the OP I feel you pain. As much as we debate the diesel vs. gas thing around here.
We don't bring up batteries very often. Gassers win the battery battle round. Diesel's require 2 batteries that don't last very long:E
Nevertheless in the end if your getting 2-3 years out of a set of batteries, and live in a place that experiences cold winters you are within the norm.
