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How do you know when it's time to replace the battery in a vehicle?

Asked by elbanditoroso (33212points) August 12th, 2013

My truck has never failed to start- and I would like to keep it that way.

The truck is almost 5 years old and is on its original battery. Lately, I have noticed that – even when driving at highway speeds when theoretically charging should be taking place – that the dashboard indicator shows voltage below the 14 mid-point. (Note: the A/C was on)

Should I be thinking about proactively replacing the battery?

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