Generator Lamp/L-Terminal Circuit Low
The L-terminal feedback line from the alternator (charging warning lamp circuit) reads below the lower limit. The lamp may stay on, and battery voltage may drift if regulation feedback is also affected.
Affected components
- Alternator
- Charging warning lamp wiring
Common causes
- High likelihood: L-terminal shorted to ground
- Medium likelihood: Alternator regulator failed
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.