Hello dieseldoc If you have 2 batteries and they are not fully charged, it may take an our or two for the alternator to bring the voltage up to 14V + or -.2 volts.A fully charged battery load test is 1/2 the battery capacity in amperes, hold the load for 15 seconds. Voltage should not drop below 9.6 volts at 80degrees F. If they pass the load test, then give the alternator time to recharge them! a couple of hrs. at least, and then check the voltage at the batteries. You can also load the alternator and see what its output is. A load placed on the alternator will make it put out close to the max or at least 95% of its rated output.
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