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2002 F55 STS, 2014 Explorer XLT, F-150s
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In Posts 1 and 3 he states that he's running an AGM battery that shows 12.3 volts at Key: ON.

His charging system is not set up to correctly maintain an AGM battery and 12.3 volts is not correct for what his fully charged (lead-acid) battery should show - 12.6.

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Food for thought ........... alternator/regulator charging protocols are different for lead-acid, deep cycle, AGM, and gel batteries. In some vehicles an incompatible battery causes problems.
 
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