Kohler-SDMO
Chronic Battery Discharge / Standby Power Issue
Battery repeatedly discharges between test runs despite charger installed
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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
Undersized or failed battery charger, Parasitic DC loads (e.g. accessories) left on, Sulfated or aged battery, Poor AC supply to charger
How to Fix / Troubleshooting
Safety first: Turn off DC power before working on battery circuits. Use PPE.
- Verify charger AC supply: Ensure the charger is connected to a reliable AC source and that its input breaker is on.
- Measure float voltage: Check charger output at the battery; adjust if possible to manufacturer-recommended float voltage.
- Check for parasitic loads: With charger off, measure current draw from the battery. Identify and correct any unnecessary loads.
- Battery test: Perform a load test on the battery. Replace if it fails or is beyond service life.
A healthy charger and battery are critical for standby reliability; consider upgrading charger capacity if frequent starts are required.
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Repair Difficulty
Medium
3/5
Required Part
Battery Charger Module
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