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If one fails for age, the other is probably going to go as well. But, with my old 2005 Ford Diesel, I accidently shorted out one battery (because you had to take a cover off to check and I screwed up), in the first year. I replaced only the battery I shorted out, and all was well for the next three plus years.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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