Nothing kills a camping trip faster than a dead generator. You pull into your site after six hours on the road, flip the switch, and get nothing. No AC, no fridge, no power. Now you’re scrambling for a repair shop in a town you’ve never been to, hoping somebody knows their way around an Onan or a Cummins. We see this at Rolling Homes RV Repair all the time — and nine times out of ten, the failure was preventable with basic rv generator maintenance done on a regular schedule.

This guide walks you through exactly what needs to happen, how often it needs to happen, and what to watch for between services. Whether you’re a full-timer logging thousands of miles a year or a weekend warrior who pulls the rig out a few times each season, keeping your generator healthy is one of the smartest things you can do for your RV.

Why RV Generator Maintenance Gets Ignored (And Why That Costs You)

Here’s the truth most RV owners don’t want to hear: your generator is basically a small engine bolted to an alternator, and it needs the same attention you’d give any engine. Oil changes, filter replacements, inspections — all of it. But because the generator lives in a compartment you rarely open, it’s easy to forget about it until something goes wrong.

And when something goes wrong with a generator, the repair bill is rarely cheap. We’ve replaced entire units for owners who skipped maintenance for two or three seasons straight. Carburetor rebuilds, seized pistons, corroded stators — all problems that start small and snowball when you ignore them.

The other issue? A lot of general mechanics won’t touch RV generators. They don’t have the manuals, they don’t stock the parts, and they don’t understand how the generator integrates with your RV’s electrical system. That’s how you end up paying diagnostic fees at three different shops before somebody finally figures out it was a clogged fuel filter the whole time.

Regular rv generator maintenance eliminates most of this. It keeps your costs predictable, your generator reliable, and your trips stress-free.

The Complete RV Generator Maintenance Schedule

Every generator manufacturer publishes a maintenance schedule, and you should follow it. But if you’ve lost your manual or just want a straightforward breakdown, here’s what we recommend based on years of working on these units in our Kansas City shop and out on mobile service calls.

Every 50 Hours of Run Time (or Once a Season, Whichever Comes First):

– Change the oil and oil filter. Use the weight and type specified by your generator’s manufacturer. Most Onan units call for 10W-30 or 15W-40, but check your model. Running old oil is the single fastest way to kill a generator engine.

– Replace or clean the air filter. A restricted air filter forces your generator to run rich, which fouls spark plugs and builds carbon deposits. If you camp in dusty areas, check the filter more often.

– Inspect the spark plug or plugs. Look for fouling, electrode wear, and proper gap. Replace them at least once a year regardless of appearance.

Every 100 Hours of Run Time (or Annually):

– Replace the fuel filter. Stale fuel and debris in your tank will clog the fuel filter over time, especially if the RV sits for weeks or months between uses.

– Inspect the spark arrestor. A clogged spark arrestor restricts exhaust flow and causes the generator to overheat or lose power under load.

– Check the coolant level and condition on liquid-cooled units. Top off as needed and flush the system every two years.

Every 500 Hours (or Every Two to Three Years):

– Replace the drive belts if your unit has them.

– Have the valve clearance checked and adjusted.

– Inspect all electrical connections at the generator and at the transfer switch for corrosion or loose terminals.

– Consider a full load-bank test to verify the generator can actually produce its rated output.

This schedule covers the vast majority of RV generators on the road. If you stick to it, you’re ahead of about ninety percent of RV owners out there.

The Biggest Mistake: Letting Your Generator Sit Idle

If there’s one piece of rv generator maintenance advice we repeat more than any other, it’s this — run your generator regularly, even when you’re not using it.

Generators that sit for months develop problems fast. Fuel goes stale and gums up the carburetor. Seals dry out. Moisture builds inside the housing and corrodes electrical components. We’ve pulled generators out of rigs that hadn’t been started in over a year, and the damage inside looked like the thing had been sitting in a swamp.

Here’s the rule: run your generator under load for at least two hours every single month. Not just idle — under load. Turn on the AC, the microwave, a couple of other appliances. The generator needs to work in order to stay healthy. Idling without a load actually causes more harm than good because it doesn’t get hot enough to burn off moisture and carbon deposits.

If your RV is in storage, add a fuel stabilizer to the tank and run the generator long enough for treated fuel to cycle through the system. Then shut it off and disconnect the battery tender if applicable. When you pull it out of storage, do a full inspection before you hit the road.

[INTERNAL LINK: RV electrical systems repair]

When to Call a Professional

Some rv generator maintenance tasks are straightforward. Changing oil, swapping filters, checking spark plugs — if you’re comfortable turning a wrench, you can handle these yourself with basic tools and a Saturday morning.

But there are situations where you need somebody who knows what they’re doing:

– The generator starts but won’t hold a load. This could be a fuel delivery issue, a governor problem, or a failing stator. Diagnosing it requires testing equipment and experience.

– You’re getting error codes or the generator shuts down on its own. Modern generators have onboard diagnostics, and the fault codes don’t always point to the obvious problem. A low-oil shutdown, for example, can be triggered by a faulty sensor even when oil levels are fine.

– The generator runs but your RV isn’t getting power. Now you’re dealing with the transfer switch, the shore power connection, or wiring between the generator and the breaker panel. This is electrical system territory, and guessing