Your 1993 American Eagle's Onan generator producing only 12-15 volts indicates a faulty rectifier bridge (part CR21) or suppressor (part RV21). The correct replacement parts are 305-0696 for the rectifier bridge and 305-0703 for the suppressor.
Keep your RV generator running reliably with this comprehensive maintenance and troubleshooting guide for Onan, Generac, and Cummins units.
Consistent 2-minute shutdown under load indicates fuel delivery cannot keep up with demand. Check fuel pump, bleed system, verify no restrictions. Also check if generator is undersized for AC load - may need soft start on AC unit.
Code 14 is overspeed but your real issue is carburetor gummed from sitting. Choke mechanism needs cleaning to operate automatically. Clean carburetor thoroughly - jets and choke linkage. Use fresh fuel and add stabilizer to prevent future issues.
After running out of gas, air is in fuel system. Hold start switch longer (15-30 seconds) to purge air. May take several attempts. Check oil level is correct after change.
Generac oil drips after breather hose replacement suggest other issues: check oil level, breather valve, hose routing, and valve seals. Clean engine and observe where oil first appears.
Some Cummins dealers limit service on older equipment but this is not universal. Call other dealers, use independent diesel shops, or find mobile RV mechanics. Many specialists focus on older Onan generator repair. Parts still generally available.
Shutting down under load after rebuild suggests carburetor still not delivering enough fuel or governor sticking. Watch governor arm movement during load test. Try gradual load increase to find threshold. Check fuel pump output if equipped.
Onan 4KY that starts but stops when start switch released is usually oil pressure sensor failure. Check oil level first. Sensor can be bypassed temporarily by grounding wire but verify actual oil pressure.
Ford V10 Fuel Pump Driver Module FPDM on Allegro Bus is on driver side frame rail near fuel tank. Small black box with single connector. Common failure point causing starting or stalling issues.
Code 36 on Onan 7500KW QD generators is often caused by overfill oil levels due to incorrectly calibrated dipsticks. The oil should read just above the 'ADD 1QT' mark, not at the full mark, to prevent pressure-induced shutdowns.
Replace failing MS2012 with Victron MultiPlus, Xantrex Freedom XC, or larger Magnum model. Check battery voltage under load first - weak batteries cause similar symptoms.
Generator shutdown causes voltage drop that trips inverter into fault. Common with AGS systems. Solutions include adjusting transfer switch timing, inverter sensitivity settings, or generator governor. May need to reset inverter after each AGS cycle.
Onan code 36 indicates a low fuel pressure issue in LP generators. This typically means a problem with the LP regulator, fuel solenoid, or gas line obstruction preventing proper fuel flow to the generator.
Running generator while sleeping can be safe with working CO detector and proper precautions. Close exhaust-side windows, check wind direction, and ensure CO detector functions. Many RVers do this safely.