The Honda Civic FD equipped with the R18A engine (a 1.8L SOHC i-VTEC engine, commonly found in the 8th-generation Civic) uses an alternator (often misspelled as atenater) to generate electrical power and charge the battery while the engine is running.

Alternator Description for Honda Civic FD R18A:

• Function: Supplies electrical power to the vehicle and charges the battery.
• Voltage Output: Typically 12V (regulated output of 13.5V–14.5V when engine is running).
• Amperage Rating: Usually between 85A and 110A, depending on the specific model or market version.
• Mounting Location: Front of the engine, usually on the passenger side (right side when sitting in the car).
• Drive Mechanism: Driven by the serpentine belt connected to the crankshaft pulley.
• Connector:
  
• Plug with 3 wires: Sense (battery voltage), IG (ignition), and L (lamp/control).
• B+ terminal (thick cable directly to the battery).
• 
  

Common Features:

• Internal voltage regulator.
• Built-in rectifier to convert AC to DC.
• Pulley with built-in clutch (in some versions).
• Cooling: Air-cooled through vent holes and internal fan.

OEM Part Numbers (may vary by market):

• Honda OEM Part: 31100-RNA-A01, 31100-RNA-A02, or equivalent.
• Compatible aftermarket brands: Denso, Bosch, Valeo, or remanufactured units.

If you’re replacing the alternator, make sure to match:

• Mounting points
• Electrical connector type
• Pulley alignment

Let me know if you need a wiring diagram or help diagnosing alternator issues.