On Your Pad

RV Generator Repair

🛠️ Common RV Generator Issues & Diagnostics RV generator failures generally fall into two categories: engine mechanical issues (it won't start or run) and electrical output issues (it runs but produces no power).1. Engine Cranks but Won't Start Fuel Starvation (The 1/4 Tank Rule): Most RV fuel pickup tubes for the generator only extend down to the 1/4 mark of the main RV fuel tank. If the RV fuel gauge is at or below a quarter tank, the generator will starve for fuel to prevent stranding the vehicle. Carburetor Gumming & Varnish: This is the #1 cause of starting failure. Modern ethanol gasoline degrades quickly when left sitting in the carburetor float bowl, clogging the tiny internal jets. Faulty Fuel Pump or Filter: Electric fuel pumps can fail from age or overheating, while fuel filters can become choked with debris from the main fuel tank.2. Generator Starts but Shuts Down Immediately Low Oil Level / Low Oil Pressure Safety: RV generators feature automatic shutdown switches. If the oil level is even slightly low, or if the sensor fails, the unit will stall within seconds to protect itself. Overheating (Cooling Constraints): Air-cooled units rely on clean cooling fins and unobstructed air intake/exhaust paths. Liquid-cooled units can suffer from low coolant levels, broken water pump belts, or failing thermostats. Faulty Flight Control / Board Codes: Modern Onan generators will blink a fault code on the start switch (e.g., Code 36 is a general engine stop). Reading these blinks is essential for rapid diagnosis.3. Generator Runs but No Electrical Power (No AC Output)Tripped Main Breaker: There is a physical circuit breaker located directly on the generator housing itself (often hidden behind the access panel). If this trips, the generator runs perfectly but sends zero power to the RV coach. Failed Transfer Switch: The automatic transfer switch (ATS) inside the RV shifts power from shore power to generator power. If the ATS contactors burn out or get stuck, your RV won't receive the generator's electricity. Worn Brushes or Slip Rings: Over time, the carbon brushes that transfer electricity from the spinning rotor can wear down or glaze over, requiring cleaning or replacement to restore excitation voltage.📋 Comprehensive Preventive Maintenance Checklist Regular servicing eliminates roughly 80% of roadside generator breakdowns. A comprehensive service schedule includes: Oil & Filter Changes: Should be performed every 100 to 150 operating hours, or at least once per year. Always use heavy-duty small engine oil specified by the manufacturer (typically 15W-40 or 10W-30 depending on ambient climate).Spark Plug & Air Filter Replacement: Inspect every 100 hours; replace if fouled or choked with dust. Spark Arrestor Clean-out: Clean out the muffler's spark arrestor screen every 50 hours to prevent dangerous exhaust backpressure buildup. The Monthly Exercise Routine: The absolute best maintenance is running the generator under a 50% load (e.g., turning on an A/C unit) for 2 hours every single month. This burns off moisture in the generator windings, prevents fuel varnish in the carburetor, and keeps the internal components lubricated.

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