1. Reset the generator-mounted breaker
Many Onan units have a small AC breaker on the generator itself. Move it fully OFF, then ON. A breaker can look halfway set and still be open. Turn large loads off before resetting.
2. Allow for transfer delay
Automatic transfer switches and energy-management systems may wait before connecting generator power. Listen for the transfer click if your system normally has one. If shore power works but generator power does not, the fault is likely in the generator output breaker, output wiring, transfer switch or control path.
3. Check the RV main panel
Reset the main breaker by pushing it firmly OFF then ON. Check branch breakers and GFCIs. A generator can be producing power while a downstream RV breaker or GFCI keeps the appliance dead.
4. Watch inverter/charger pass-through
Some RVs route selected outlets through an inverter/charger. It may have its own input breaker, output breaker, pass-through delay or error. If only some outlets are dead, the inverter path may matter more than the generator.
5. When it is not an owner repair
Testing generator voltage, frequency, stator output, regulator condition or transfer-switch terminals requires live AC electrical work. That belongs to a qualified generator/RV electrical technician.
Related pages
- RV generator transfer switch problems
- RV breaker trips when plugged in
- Lights work but outlets don't
- 120V and 12V systems guide
- Generator troubleshooting guide
Sources and review notes
Use the installed generator manual, RV electrical diagram and transfer-switch manual. Cummins' RV generator power basics and official generator manuals are useful starting points.