Slant 6 Voltage Regulator Syracuse Nationals

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Battery chemistry has changed some over the decades. You should see 14.5 or better on a cold start - there is temperature compensation built into the systems.

13.8 can be too low to properly charge a battery with calcium in the lead. Changing battery chemistry can also change the resting voltage. some batteries will rest @ 13v when fully charged.

On a car that is driven infrequently, the initial charge on cold start will always be high. Batteries self-discharge, and the alternator tries to fix that asap on startup.

B.