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Alternators don't charge 12.4 volts, If the battery with engine running is at 12.4volts your just reading battery voltage and none of the alternators output is reaching the battery, Test the output terminal on the back of your alternator it should be the same as at your battery if it is more (engine running) or less (engine not running) by more then .2 of a volt check that wire for a burnt out fuseable link section or check underhood fuse box for a blown fuse (generally about 120amp fuse). allso unplug the regulator plug from your alternator and with your ignition key in the "Run" position (engine stopped) you should have atleast 1 if not 2 terminals (depends on aplication) in the plug end coming from your vehicals wiring harness powered. if not check fuses and these wires for breaks.

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Q: Alternator charging 12.4 volts i replaced the alternator and same problem persists?
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