RV Generator Repair in Denver, CO

RV Generator Repair in Denver, Colorado — Altitude-Aware Service for Onan, Generac & More

Denver's 5,280-foot elevation is one of the most important — and most overlooked — factors in RV generator performance. Internal combustion engines lose approximately 3% of horsepower for every 1,000 feet of elevation gain, which means your Onan MicroQuiet 4000 is already operating at roughly 84% of its sea-level capacity before any maintenance issues arise. When you add a rich-running carburetor, a dirty air filter, or a failing voltage regulator, a Denver generator can shut down under load within minutes. We service generators with altitude-specific calibrations and carry parts for the most common RV generator brands in our fully stocked vans.

Onan MicroQuiet and BGE Series Service in Denver

The Onan MicroQuiet 3600 and 4000 series are the most common generators found in Class A and Class C motorhomes throughout the Denver metro. At altitude, the Onan's fixed-jet carburetor typically runs richer than necessary, resulting in black exhaust smoke, excessive fuel consumption, and the characteristic "loading up" shutdown under AC load. We perform the full Onan tune-up — new spark plugs, oil and filter change, air filter replacement, fuel filter replacement — and re-jet the carburetor for Denver's elevation. We also test the unit under realistic load using a calibrated load bank to verify it can sustain the amperage your AC system demands before we leave your site.

The Onan BGE and BGEL series found in older Class A coaches are carbureted LPG generators that have their own altitude challenges. At 5,280 feet, LPG vapor pressure is slightly lower than at sea level, and the mix screw on these older carburetors often needs adjustment for clean running. We carry rebuild kits for the BGE carburetor and can restore these units to reliable operation at altitude.

Generac and Cummins RV Generator Diagnostics

Generac RV generators are common in fifth wheels and newer Class A coaches. The Generac Quietpact series uses an electronic fuel injection system that stores fault codes accessible with a scan tool — we carry the interface to read and clear these codes, which often point to a throttle body, oxygen sensor, or fuel pump issue. Cummins Onan Quiet Diesel units in premium diesel pushers require diesel-specific diagnostics including injector pressure testing and EGR inspection — services we perform with our diesel-capable diagnostic equipment.

For any generator that runs but trips on high engine temperature at Denver campgrounds, we inspect the exhaust outlet and compartment ventilation first. Proper exhaust backpressure and fresh air intake are both critical for generator cooling, and campground parking situations — particularly at Cherry Creek State Park Campground where sites can be close together — sometimes position the exhaust directly in a corner with poor airflow. We can modify or extend generator exhaust routing when the installation geometry creates overheating.

Automatic Transfer Switch and Remote Start Service

An automatic transfer switch (ATS) that fails to transfer from shore power to generator — or vice versa — is a frustrating problem that often mimics a generator failure. We test ATS units from Cummins, Progressive Industries, and Intellitec independently from the generator to isolate which component has actually failed. Remote start systems with dead keypads or failed solenoids are another common repair we handle on-site. After every generator service in the Denver metro, we verify that the ATS transfers cleanly and that the remote start activates the unit reliably before considering the job complete.