RV Electrical Repair (12V & 120V) in Lancaster, CA
RV electrical systems combine 12V DC battery power with 120V AC shore/generator power. Our certified technicians troubleshoot dead outlets, blown fuses, failing converter chargers, Lithium/AGM battery bank upgrades, and flickering lights.
Service Quick Overview
Understanding rv electrical repair (12v & 120v) for your RV
RV electrical repair covers both the 12-volt DC system that powers lights, fans, water pumps, and slide-out motors from the house battery, and the 120-volt AC system that runs outlets, microwaves, and air conditioners from shore power or a generator. Javi's RV Services Center in Lancaster troubleshoots converters, inverters, transfer switches, battery banks, and the full wiring harness connecting them.
Most RV electrical failures are not a single bad part — they are a chain reaction. A failing converter stops charging the battery, the battery drains, the inverter faults, and the lights go out. Our shop isolates each circuit so we repair the actual failed component instead of repeatedly replacing parts that were never the problem.
Signs You Need RV Electrical Repair (12V & 120V)
If you recognize any of these symptoms, call our Lancaster shop to schedule a diagnostic before the problem worsens.
How RV Electrical Repair (12V & 120V) Works at Javi's
Dual-System Diagnostic
We load-test the 12V battery bank, verify converter output, check inverter behavior, and trace each 120V circuit to isolate the failed component — battery, converter, inverter, transfer switch, or wiring.
Component-Level Repair Plan
You get a written estimate identifying the exact failed part and the recommended repair or upgrade, including Lithium conversion options if your system supports it.
Shop Repair & Replacement
Failed converters, inverters, transfer switches, and wiring are replaced inside our Lancaster shop with proper disconnect and load testing throughout.
Full System Verification
We verify charging on shore power, inverter output, breaker coordination, and 12V/120V isolation so your electrical system behaves correctly in every mode before pickup.
Call for a Written Estimate
Every RV and repair is different, so we quote from a written estimate after inspecting your vehicle — you authorize the scope and cost before any labor begins. Call the Lancaster shop to discuss your RV and the work you need.
Call (661) 942-2492Why Our Shop Wins
Common Symptoms We Repair
Questions RV Owners Ask
Q: Why won't my RV batteries charge when plugged into shore power?
The most common cause is a failed converter/charger — the box that turns 120V shore power into 12V charging current. We load-test the converter output and the battery bank together to confirm whether the converter, the battery, or the wiring is the actual culprit.
Q: Can you upgrade my RV to Lithium batteries?
Yes. We install LiFePO4 battery banks with the correct BMS and confirm your converter or solar charge controller has a Lithium charging profile so the new batteries charge and balance correctly.
Q: Do you repair inverter error codes?
Yes. Inverter faults usually point to low battery voltage, overload, or a failed control board. We diagnose the underlying cause rather than just clearing the code, so the fault does not return.