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Check the battery voltage while cranking. It should be > 10.5v.
The voltage @ 2000RPM should be 14.5v.
If cranking voltage is below the min. Have the batteries load tested. If one is bad, replace both of them at the same time. A weak battery will bring a new one down to its level and cause it to fail prematurely.
If 2000RPM voltage is below 14.1, your alt could be going out or gone.
A good charging system should never need to be charged with an external charger and with one, indicates a battery/alt problem.
02 F350 4x4 SRW EC LB Lariat
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