Narrative:

While in cruise at FL380 with first officer as the pilot flying; we had master caution lights illuminate and found 7 lights lit on the annunciator panels; 3 on the ca side and 4 on the first officer side. There were approximately 20 yellow system warning lights illuminated on the overhead and the instrument panels. The following lights were illuminated immediately: TCAS fail; terr fail; RA; number 1 fwd and number 2 aft fuel low press; yaw damper; TR unit; lt fwd and rt side window overheat lights; printer fail; stabilizer out of trim; ground proximity inoperative; captain pitot; left elev pitot; left alpha vane; temperature probe; equipment cooling exhaust off; elec 2 and elec 1 hydraulic low press. The number 1 generator was indicating 0 AC volts and 0 AC amps. At glide slope; the following came on: lt fwd overwing; lt aft overwing; speed brake do not arm; anti skid inoperative. The ca's flight director was inoperable.after conferring with dispatch and maintenance control we switched our destination because the checklist for the inoperable yaw damper specified no greater than 30 degrees of flaps. The plane functioned normally for the remainder of the flight. I remained as the pilot monitoring for the rest of the flight to be able to watch for additional degradation in the aircraft systems. The approach and landing were uneventful. The APU had been started in flight but would not pick up any aircraft electrical loads after landing. Even when parked at the gate with engines running; the ground power would not pick up any airplane loads until both engines were shut down. I have no idea what happened. I hope to get a report on the malfunction once the repair is made.

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Original NASA ASRS Text

Title: B737-800 Captain reported the left generator failed in flight and the electrical load failed to transfer to either the right generator or APU.

Narrative: While in cruise at FL380 with FO as the pilot flying; we had Master Caution lights illuminate and found 7 lights lit on the annunciator panels; 3 on the CA side and 4 on the FO side. There were approximately 20 yellow system warning lights illuminated on the overhead and the instrument panels. The following lights were illuminated immediately: TCAS FAIL; TERR FAIL; RA; Number 1 FWD and Number 2 AFT FUEL LOW PRESS; YAW DAMPER; TR UNIT; LT FWD and RT SIDE Window Overheat lights; PRINTER FAIL; STAB OUT OF TRIM; GND PROX INOP; CAPT PITOT; L ELEV PITOT; L ALPHA VANE; TEMP PROBE; EQUIP COOLING EXHAUST OFF; ELEC 2 and ELEC 1 Hydraulic LOW PRESS. The Number 1 Generator was indicating 0 AC Volts and 0 AC Amps. At Glide Slope; the following came on: LT FWD OVERWING; LT AFT OVERWING; SPEED BRAKE do not ARM; ANTI SKID INOP. The CA's flight director was inoperable.After conferring with Dispatch and Maintenance Control we switched our destination because the checklist for the inoperable YAW DAMPER specified no greater than 30 degrees of flaps. The plane functioned normally for the remainder of the flight. I remained as the Pilot monitoring for the rest of the flight to be able to watch for additional degradation in the aircraft systems. The approach and landing were uneventful. The APU had been started in flight but would not pick up any aircraft electrical loads after landing. Even when parked at the gate with engines running; the Ground Power would not pick up any airplane loads until both engines were shut down. I have no idea what happened. I hope to get a report on the malfunction once the repair is made.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.