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Has happened twice in the past month; Truck will not charge, Check Gauge light comes on. After 20-25 miles with voltage dropping <10; truck will start charging. No CEL, unable to pull codes. Readers do not connect to my DLC

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Sounds like a CCD Network issues why you can pull codes. As for the charging problem I would pull the alternator and have it bench test and check both the brushes and diode performance.