Test T: Dual Generator Upper Fault Detected (P0620)

PINPOINT TEST T: DUAL GENERATOR UPPER FAULT DETECTED (P0620)

T1:

T2-T4:

T5-T7:

T8:

Normal Operation
The generator output is determined by the voltage of the A circuit 35 (OG/LB). The A circuit voltage is compared to a set voltage internal to the regulator and the regulator controls the generator field current to maintain the correct generator output. The set voltage varies with temperature and is typically higher in cold temperatures and lower in warm temperatures.

Possible Causes
- circuitry
- B+ circuit fusible links
- upper generator