Free RV manual
How to Run an RV Generator
Starting it, loading it, keeping it healthy, and staying safe from exhaust.
Built in or portable
Motorhomes and some big fifth wheels have a built in generator. It usually runs on gasoline from the main tank, on propane, or on diesel. Many models stop drawing fuel when the main tank gets to about a quarter full, so you can still drive.
Trailers often use a portable inverter generator. Keep it well away from windows, doors and vents.
Starting it
- Turn off the big loads first, like the air conditioner and microwave.
- Hold the start switch. Most will crank, catch and settle in a few seconds.
- Let it warm up for a couple of minutes.
- Turn on the loads one at a time.
Carbon monoxide
Exhaust can kill. Check the CO alarm before every trip. Never run the generator while you sleep unless the exhaust clearly blows away from the RV and the alarm works.
Watch for snow banks, walls or other RVs that trap exhaust near your RV. Follow the quiet hours at your campground too.
Keeping it healthy
Run it under a real load for about two hours each month, even in storage. Fuel that sits goes stale and gums up the carburetor.
Check the oil level before long runs. Follow the hour meter for oil changes. Your generator manual lists the interval.
When to call a shop
Call a shop if the generator surges, dies under load, puts out black smoke, or the CO alarm goes off. Exhaust leaks and fuel problems need a trained tech.
The maker's own manuals
These guides cover how most RVs work. Your own rig may differ, so check the manual for your make and model.
- Cummins Onan · RV generators
- Every maker we link to