RV Electrical Repair & Diagnostics
Professional mobile troubleshooting for RV 12-volt and 120-volt electrical systems, batteries, converters, inverters, shore power, charging systems, breakers, fuses, outlets and related electrical problems.
Common RV Electrical Problems We Diagnose
RV electrical problems can look simple while actually being caused by several different systems working together. Instead of replacing parts based only on symptoms, MilTech RV uses testing and measurements to help identify the actual cause of the problem.
Lights, water pumps, controls or other DC-powered equipment are not operating.
The RV is plugged in, but outlets, appliances or other 120V equipment are not working.
Batteries continue to discharge even while the RV is connected to shore power.
Low charging voltage, blown fuses, intermittent DC power or converter failure.
Inverter will not power loads, will not transfer properly or reports a fault.
Repeated breaker trips, blown DC fuses or circuits that suddenly stop working.
Some appliances or circuits work while others remain dead or intermittent.
Power comes and goes, equipment resets unexpectedly or problems appear only under load.
Dead receptacles, GFCI trips, loose connections or power missing from part of the RV.
12-Volt RV Electrical Systems
12V DC Electrical Diagnostics
Your RV's 12-volt system powers many essential components including lighting, water pumps, control boards, slide and leveling controls, furnace electronics, refrigerator controls and other equipment.
We can diagnose issues involving batteries, battery disconnects, DC distribution panels, fuses, grounds, wiring, low-voltage conditions and other problems that prevent 12V equipment from operating correctly.
120-Volt RV Electrical Systems
Shore-Power and AC Electrical Diagnostics
The 120V system supplies power to RV receptacles and many major appliances when connected to campground shore power, a generator or certain inverter systems.
Diagnostic testing may include checking incoming voltage, electrical connections, breakers, GFCI protection, branch circuits and power delivery to affected appliances or equipment.
RV Batteries & Charging Systems
Battery and Charging Diagnostics
If your RV battery dies quickly, will not charge or shows unexpected voltage, the battery itself may not be the only problem.
We can evaluate battery voltage, charging voltage and related system operation to help identify problems involving the converter, charging circuit, battery connections, disconnect systems or other charging components.
Converter & Inverter Diagnostics
Converter Troubleshooting
The converter normally changes incoming 120V AC power into 12V DC power and supports the RV's battery-charging system. A failed converter can cause weak batteries, low DC voltage or loss of 12V equipment.
Inverter Troubleshooting
RV inverter systems use battery power to supply AC electricity to selected appliances and outlets. Depending on the RV, diagnostics may involve input voltage, output power, fault codes, transfer operation, wiring or system controls.
RV Shore-Power Problems
Plugging into a campground pedestal does not automatically mean correct power is reaching every part of your RV.
When Shore Power Isn't Working Correctly
We can troubleshoot problems between the power source and the RV electrical system, including missing power, low voltage symptoms, breaker issues, power distribution problems and situations where only part of the RV has 120V power.
Breakers, Fuses & RV Outlets
Finding the Cause — Not Just Resetting the Circuit
A tripped breaker or blown fuse is often a symptom rather than the root cause. Repeated failures may indicate an overloaded circuit, failed component, damaged connection, wiring issue or another electrical problem.
We can diagnose circuit protection problems, dead outlets, GFCI issues and electrical circuits that repeatedly lose power.
What to Expect From an RV Electrical Diagnostic
Our goal is to diagnose the system before recommending parts. Electrical problems can have several possible causes, so measurements and testing are an important part of determining the correct repair.
We start with what you are experiencing, when it happens and what equipment is affected.
We check accessible wiring, components, connections, breakers, fuses and related equipment.
Electrical measurements help narrow the problem instead of relying only on visual inspection.
Once testing points to the failure, we explain what was found and the recommended repair.
When the repair is within our mobile service capabilities, we can discuss parts, labor and scheduling.
RV Electrical Service Pricing
Electrical troubleshooting is billed based on the time required to diagnose and repair the problem. Some electrical faults can be identified quickly, while intermittent or multi-system problems may require additional testing.
Mobile RV Electrical Service Areas
Greater Des Moines, Iowa
During our Iowa season, MilTech RV provides mobile RV electrical diagnostics throughout the Greater Des Moines area, including Des Moines, Ankeny, West Des Moines, Urbandale, Altoona, Johnston, Clive, Waukee, Pleasant Hill, Grimes and Bondurant.
2026 Iowa appointments: through October 14, 2026.
Returning to the Des Moines area: April 14, 2027.
Yuma, Arizona
During our winter season, MilTech RV provides mobile RV electrical service in the Yuma area, including Yuma, Fortuna Foothills, Wellton, Somerton and surrounding RV parks and resorts.
2026–2027 Yuma season: November 12, 2026 through March 26, 2027.
We come to your RV so many electrical problems can be diagnosed without taking your motorhome, fifth wheel or travel trailer to a dealership.
RV Electrical Repair FAQ
Do you diagnose both 12V and 120V RV electrical problems?
Yes. MilTech RV diagnoses common 12-volt DC and 120-volt AC electrical problems, including batteries, converters, inverters, shore-power circuits, fuses, breakers, outlets and related RV electrical equipment.
Why does my RV have no 12V power even though it is plugged into shore power?
Possible causes include a discharged battery, battery disconnect problem, blown fuse, converter issue, poor connection, grounding problem or other failure in the DC electrical system. Testing is needed to determine the actual cause.
Why isn't my RV battery charging while plugged in?
A battery that does not charge on shore power may have a battery problem, converter problem, blown fuse, poor cable connection, disconnect issue or another charging-system fault. Voltage testing helps determine where charging power is being lost.
Can you diagnose a bad RV converter?
Yes. Converter diagnostics can include checking AC input, DC output, battery-charging voltage, related fuses and system operation before recommending converter replacement.
Can you troubleshoot an RV inverter?
Yes, depending on the system and failure. We can evaluate common inverter problems involving battery input, output power, fault indications, controls and transfer operation.
Why do my RV breakers or fuses keep tripping?
Repeated trips or blown fuses may be caused by excessive electrical load, a failed appliance or component, damaged wiring, poor connections or another circuit fault. Repeatedly resetting a breaker or replacing a fuse without finding the cause is not recommended.
Do you work on electrical problems at RV parks and campgrounds?
Yes. MilTech RV is a mobile RV repair service. We come to your RV within our service area, including RV parks, resorts, campgrounds and customer locations where service access is permitted.
How much does an RV electrical diagnostic cost?
The standard mobile service call is $75 and the first diagnostic hour is $150. Additional diagnostic or repair labor is $150 per hour. Parts, materials and applicable travel charges are additional.
Do you replace electrical parts before diagnosing the problem?
Our normal approach is to test the system first whenever practical. Electrical symptoms can have several possible causes, so diagnosis can help avoid replacing a component that is not actually responsible for the problem.
Need Help With an RV Electrical Problem?
Tell us what your RV is doing, what equipment is affected and any fault codes, warning lights or recent electrical work you have noticed. MilTech RV can come to your RV and begin diagnosing the problem.
MilTech RV Repair & Inspection
Mobile RV Repair • Diagnostics • Maintenance • RV Inspections