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charging question. My 09 6.7 cummins wouldn't start this morning. Battery terminal was corroded so I cleaned and jumped it. the gauge is showing just over 14 volt charge and a volt meter on the battery is comfirming so. Shortly after it was running the gauge dropped to about 10 volts (meter confirmed this), then within a few seconds went back up to 14.5-15 volts. it kept doing this for a few minutes then stopped. Is this normal? Anyone else experiencing this and how did you fix it? Thanks
That is normal. When the truck is first started the heater grid on the intake cycles on and off until the correct temperature is reached.
 
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