Expert Generator Service in Lakeland, FL
Your RV generator is the heart of your off-grid comfort. It powers the air conditioning, the refrigerator, the microwave, the entertainment system, and every outlet in your coach when you are away from shore power. In Florida, where summer temperatures routinely push past 95 degrees with humidity to match, a working generator is not a luxury—it is a necessity. Without it, your RV becomes an oven on wheels within minutes of parking.
At Nationwide Haul in Lakeland, FL, our technicians are trained on all major RV generator platforms. Whether you are running a Cummins Onan that came factory-installed in your Class A or a Generac unit in your fifth wheel, we have the expertise and the 2026 diagnostic technology to pinpoint issues accurately and get your power back online. We do not guess—we test, diagnose, and fix.
Generator Services We Provide
Diagnostics & Troubleshooting
Generator problems are rarely obvious. A no-start condition could stem from a dead starter motor, a faulty fuel pump, a corroded ground wire, or a control board that has lost its programming. Intermittent shutdowns can be caused by overheating, low oil pressure, overload conditions, or failing voltage regulators. Our diagnostic process covers no-start conditions, intermittent shutdowns, fault code reading, load testing, and voltage/frequency analysis. We use generator-specific diagnostic tools that read Onan and Generac fault codes that generic automotive scanners cannot see. This means we find the actual problem on the first visit—not after three rounds of parts swapping.
Routine Maintenance
Regular maintenance is the single most effective way to prevent generator failures, and it is the service most RV owners neglect. Our routine generator maintenance includes oil and filter changes, air filter replacement, spark plug service (gas generators), fuel filter replacement, coolant service (diesel generators), and exercise schedule recommendations. We also inspect belts, hoses, exhaust connections, and electrical terminals for wear and corrosion. Regular maintenance prevents 90% of generator failures. If your generator has been sitting idle for months between trips, that is exactly when problems develop—stale fuel, dried seals, and corroded contacts are the leading causes of no-start conditions in RV generators.
Major Repairs
When your generator needs more than maintenance, our technicians have the training and tooling to handle serious repairs. We perform control board replacement, voltage regulator repair and replacement, stator and rotor service, starter motor rebuilds and replacements, fuel pump service, carburetor rebuilds (gas generators), and injector service (diesel generators). We stock common Onan parts including control boards, fuel pumps, voltage regulators, and ignition components—which means faster turnaround times instead of waiting weeks for a part to ship from the factory. For older generators that are no longer cost-effective to repair, we can advise you on replacement options that match your RV's electrical demands and mounting configuration.
Installation & Upgrades
Whether you are replacing an aging generator with a modern, quieter unit or upgrading your electrical system to support new appliances, we handle the full scope of installation work. Our services include complete generator replacement, transfer switch service and installation, auto-start system integration, exhaust system repair and rerouting, vibration isolation mount replacement, and fuel system integration. A generator swap is not as simple as bolting in a new unit—it requires matching the electrical output to your RV's load demands, verifying the transfer switch compatibility, ensuring proper exhaust routing, and calibrating the auto-start system if equipped. We handle all of it so your new generator runs right from day one.
Generator Brands We Service
Our technicians have hands-on experience with every major RV generator brand on the market. We service Cummins Onan generators including the QG series (gasoline), MDKD (diesel), and HDKCA/HDKCB (diesel)—the most common generators found in Class A and Class C motorhomes. We also service Generac (Guardian and QuietPact series), Kohler mobile generators, Westerbeke marine-grade units found in some luxury coaches, and Honda EU series portable generators that many travel trailer and fifth wheel owners rely on.
We specialize in Onan—the number one generator brand in Class A and Class C RVs. When your coach rolled off the assembly line, there is a strong chance it came equipped with an Onan genset, and our technicians know these units inside and out. From the QG 4000 in your Class C to the HDKCA 12500 in your diesel pusher, we have the factory-level knowledge and parts access to service them correctly.
Common Generator Problems We Fix
RV generators fail in predictable patterns, and we have seen them all. Here are the most common issues that bring generator owners to our shop:
- Won't start or hard starting — often caused by stale fuel, failed fuel pumps, or corroded electrical connections
- Runs but no power output — typically a voltage regulator, brushes, or stator winding failure
- Surging or unstable voltage — can damage sensitive electronics and appliances if not corrected
- Overheating and auto-shutdown — blocked cooling passages, failed thermostats, or low coolant (diesel units)
- Excessive smoke or oil consumption — worn rings, valve guides, or head gasket issues
- Error codes and fault lights — require generator-specific scan tools to read and interpret
- Fuel delivery issues — clogged filters, failing pumps, or deteriorated fuel lines
- Exhaust leaks — dangerous carbon monoxide risk that requires immediate attention
If your generator is exhibiting any of these symptoms, do not ignore it. A small problem today becomes an expensive repair tomorrow—and in the case of exhaust leaks, it becomes a safety hazard.
Why RV Owners Trust Us for Generator Work
- Onan-specialized technicians with factory-level training on the most common RV generator platform in the industry
- 2026 diagnostic tools that read generator-specific fault codes—not generic automotive scanners that miss generator-only systems
- Common Onan parts in stock for faster turnaround—control boards, fuel pumps, regulators, and ignition components on the shelf
- Transparent estimates before work begins — you know exactly what the repair costs before we turn a wrench, with no surprises on your invoice
- We test under load — not just a quick start-and-listen. Every generator repair is verified under full electrical load to confirm voltage stability, frequency accuracy, and proper operation of the transfer switch before we call it done
Generator Emergency?
If your generator failed mid-trip and you are stuck without air conditioning in the Florida heat, we understand the urgency. A dead generator in July is not an inconvenience—it is a health concern, especially for families with young children or elderly passengers. Contact us for priority scheduling or reach our RV roadside assistance team if you need help on the road. We will do everything we can to get your power restored quickly and safely so you can get back to enjoying your trip.