Cummins Chronic Battery Discharge

Battery repeatedly goes dead between exercise runs

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Possible Causes

Undersized or failing battery charger, Parasitic DC loads, Old or sulfated battery, Poor battery cable connections

How to Fix / Troubleshooting

Safety first: Disable automatic start. Use eye protection when working around batteries.

  • Test battery: Have the battery load-tested. Replace if it fails or is older than the recommended service life.
  • Check charger output: With AC power present, verify the Cummins charger maintains proper float voltage. Replace if output is low or absent.
  • Parasitic loads: Ensure no unauthorized devices are connected to the generator’s DC system.
  • Cable integrity: Clean and tighten all battery and ground connections to reduce resistance and improve charging.
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Repair Difficulty

Easy 2/5

Required Part

Starting Battery
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