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Message: [QUOTE="CATDiezel, post: 1428090, member: 4387"] How were the batteries load tested? What device. It sounds to me like a low fluid level in one of the batteries. However. If you replace one please replace both. I've also seen the plates in batteries deteriorate and break causing intermittent issues. 12.5v raises a small concern to me. A charged battery should be 12.6 floating volts. 2.1v per cell. If your up for the test. Pull the caps on the batteries and with a good voltage meter put the ground lead on ground and use an extension (so your not dipping the meter lead in battery acid directly) and check each cell on the battery. 2.1v is what you want to see. The regulators on the alternators are going to try and give you 14ish volts even with 2 bad batteries. If the batteries were tested with a digital battery tester that also measures internal resistance and continuity between plates then your good. If it was a toaster tester then not so accurate. A battery store should have the proper tester. Hope that helps some. [/QUOTE]

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