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If you are noticing the volt gauge fluctuating on a cold start, that is normal. The intake heater grid is doing its normal cycle. It pulls enough voltage to cause the gauge and the headlights to dim. If you are having a dead battery you need to check to see if both batteries are getting the charging voltage from the alternator. You could have a connection problem where only the passenger side battery is actually being charged.

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Q: Why does your 2010 dodge diesel 6.7 Cummins go to charge every morning clicks and then goes to discharge and it keeps repeating eventually it drains your battery?
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