Truma Battery Charger BC 10
The Truma BC 10 is a professional 10A switch-mode battery charger featuring an 8-step fully automatic charging cycle. It is designed to charge and maintain all types of 12V lead-acid batteries (WET, MF, Ca/Ca, AGM, and GEL) and includes temperature-compensated charging and a dedicated 12V power supply mode.
View official manual on manufacturer's site ↗Technical Specifications
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
Error Lamp Lit | Incorrect connection, wrong battery voltage, or interrupted charging. | — | 1. Make sure the charger's positive (+) lead is on the battery's positive terminal.
2. Check the battery is a 12V one.
3. Check whether charging stopped at STEP 1 (battery badly sulphated), STEP 2 (it won't take a charge) or STEP 5 (it won't hold a charge), then press MODE to restart it. | DIY Safe |
Power Lamp Flashing | The charger has entered energy save mode. | — | The charger drops into energy-save mode when it isn't hooked up to a battery within 2 minutes of being plugged in at the mains. Attach it to the battery. | DIY Safe |
Still not at STEP 7 after 55 hours of charging | Indication of a battery or charging error. | — | Manually disconnect the charger from the mains and the battery. | DIY Safe |
Error indicator light is ON | Incorrect connection, wrong battery voltage, or a defective battery that cannot hold a charge. | — | 1. Make sure the positive cable is on the positive terminal.
2. Check the battery is a 12V one.
3. If charging stopped during STEP 1, 2 or 5, disconnect the battery and press MODE to start again. If it stops again, the battery may be faulty and need replacing. | DIY Safe |
Power indicator light is FLASHING | The charger is in energy-saving mode because it has not been connected to a battery within 2 minutes of being plugged in. | — | Connect the charger to a battery to initiate the charging process. | DIY Safe |
Still not at STEP 7 after 55 hours of charging | A fault has occurred during the charging process. | — | Manually disconnect the charger from the battery. | DIY Safe |
Frequently Asked Questions
Q: What types and capacities of batteries can the BC 10 charge?
Any 12V lead-acid battery - wet, maintenance-free (MF), calcium (Ca/Ca), AGM or gel. It charges batteries of 20-200Ah, and for maintennce charging, up to 300Ah.
Q: How do I know when the battery is ready to use or fully charged?
Once STEP 4 (Absorption) lights up, the battery has enough charge to start an engine. When STEP 7 (Float) lights up, it's fully charged.
Q: What is the purpose of the Supply program?
Supply lets you use the charger as a 12V power supply, or keep the battery on float charge when you need it at full (100%) capacity. Spark protection is switched off while Supply is selected.
Q: Can the BC 10 be used as a constant 12V power supply?
Yes, by selecting the 'Supply' program, the charger can be used as a 12V power supply or for float maintenance charging. Note that spark protection is disabled in this mode.
Q: What is the purpose of the external temperature sensor?
The external temperature sensor allows the charger to automatically adjust the charging voltage based on the ambient temperature. If it is not connected, the charger will not compensate for temperature.