Pramac
Battery Charging / Parasitic Drain Issue
Generator battery repeatedly goes flat between test runs
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed integrated battery charger, No AC supply to charger, Excessive parasitic load from accessories, Aged battery with high self-discharge
How to Fix / Troubleshooting
Safety first: Wear eye protection when working on batteries. Disconnect negative terminal before major work.
- Check charger supply: Confirm that the generator's internal charger is connected to a live AC source as per Pramac installation instructions.
- Measure charge voltage: With AC present, battery voltage should be around 13.4–13.8 V. If it remains near 12 V, the charger may be faulty.
- Inspect for drains: With the generator off, measure current draw from the battery. Excessive draw may indicate a stuck relay or accessory left on.
- Replace charger or battery: Install a new Pramac-approved charger if no output. Replace the battery if it fails a load test.
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Repair Difficulty
Medium
3/5
Required Part
Battery Charger Module
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