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- '17 CX-5 Select
You my have solved this already, but for the thread; batteries can accept charge and the terminal voltage will rise making it *appear* OK, but it may have high internal resistance and not turn the starter, but it might be good enough to light the interior lights and headlights. A new battery can be defective (Bad Out of Box) or just old and tired, or a cell can fail upon the next start when a current surge it demanded.
It's the voltage RIGHT AT THE BATTERY POSTS when cranking you need to look at for a quick go/no go. If the battery voltage starts at 12.2 ~ 12.6v (a decently to fully charged battery), but drops below about 10 volts during cranking, the battery is spanked. If the battery voltage remains above 10v when the cranking is attempted, BUT it turns over weakly or not at all, then it's a connection to the battery.
It's the voltage RIGHT AT THE BATTERY POSTS when cranking you need to look at for a quick go/no go. If the battery voltage starts at 12.2 ~ 12.6v (a decently to fully charged battery), but drops below about 10 volts during cranking, the battery is spanked. If the battery voltage remains above 10v when the cranking is attempted, BUT it turns over weakly or not at all, then it's a connection to the battery.
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