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Mine last 2 have always done that, when the grid heater is running(cold weather start) it shows discharging then fine as the truck warms up. It's the normal operation for a Cummins
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Mike & Donna Ishler Ontario, NY KE2LU FN13
2017 3720RL TST S637's
2017 Dodge 3500 Laramie CTD 4x4 Auto
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