performance, battery, mileage - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 01-21-2011, 08:22 AM Thread Starter Rookie
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Talking performance, battery, mileage

Can low/weak/bad batteries cause performance and mileage issues. Just asking out of curiosity.
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post #2 of 5 Old 01-21-2011, 01:36 PM
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Typically if the batteries are bad, it won't even start or just barely. I would guess it may slightly effect performance, but I doubt you would notice it. Most likely it just wouldn't like to start...

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post #3 of 5 Old 01-21-2011, 09:03 PM
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Low batteries will cause the alternator to work harder resulting on more load on the engine. You'll have a hard time measuring the difference, and you won't be able to feel it.

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post #4 of 5 Old 01-21-2011, 09:13 PM
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the battery is really only for starting and grounding, the alternator takes over everything once the truck is running

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post #5 of 5 Old 01-21-2011, 09:16 PM

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should be good to go if you can start it. other than possibly leaving you stranded when you need it most cause it wont start.

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Troubleshooting a No-Start Condition

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