Are you looking to add an upgrade like or a lithium battery ?

Located on the primary side of the internal switching power supply circuit board.

: The manual provides detailed schematics that allow technicians to trace faults in the 12V distribution system.

A frequent point of failure is "burnt pins" on the refrigerator connector due to high current draw and oxidation over time. Our Bumble Official Documentation Links

Is 230V power reaching the Electrobloc? (Test the socket).

Supplies continuous 12V power to the Truma or Alde heating ignition and fan systems.

If you can provide a description of the device (e.g., "It has a 12-button keypad and a cable," or "It is a small black box that plugs into a wall"), I can provide the exact full text manual you need.

Lead-acid and lead-gel batteries (minimum capacity 50 Ah). Operating Temperature Range: -20°C to +45°C.

Are the flat vehicle fuses (ATO fuses) on the front panel blown?

Only use fuses of the same rating (5A to 20A) as printed on the front panel.

Typically 18A (though older C-models may be 16A). End of Charge Voltage: 14.3V. Float Charge Voltage: 13.8V.