RV 12V & 120V Electrical Repair

We provide comprehensive diagnostics, repairs, and upgrades for both low-voltage DC (12-volt) and standard AC (120-volt) systems in your RV. That includes battery banks — lead-acid, AGM, lithium-ion, Battle Born, SOK — along with Victron complete systems, inverters, converters, solar charge controllers, wiring harnesses, circuit breakers, outlets, and grounding.

Using multimeters, load testers, thermal imaging, and voltage drop analysis, we trace faults, repair shorts, replace corroded terminals, and optimize charging curves. Every job follows NEC, RVIA, and manufacturer specs.

Electrical issues in RVs can be frustrating and even dangerous if left unaddressed. Loose connections, corroded wiring, and overloaded circuits are fire hazards. We take electrical safety seriously and ensure every repair meets or exceeds industry standards. Your rig delivers stable power, zero downtime, and long-term reliability — no matter how far off-grid you go.

Common RV Electrical Problems We Fix

RV electrical systems run dual 12V DC and 120V AC systems simultaneously, creating unique diagnostic challenges. Here are the most common issues we see:

Dead or weak batteries: Batteries that won't hold a charge, have reduced capacity, or die overnight. We load-test individual batteries, check charging system output, and identify parasitic draws that drain batteries when everything should be off.

Converter/charger failures: The converter takes shore power and charges your batteries while powering 12V systems. When it fails, your batteries die and 12V accessories stop working. We test and replace converters from all manufacturers.

Flickering or dim 12V lights: Usually caused by voltage drops from corroded connections, undersized wiring, or a failing converter. We trace the circuit from source to load to find the weak link.

GFCI outlets tripping: Ground fault circuit interrupters trip for a reason — moisture intrusion, a faulty appliance, or wiring faults. We diagnose the cause rather than just resetting the breaker.

No power on shore hookup: Could be a faulty shore power cord, a tripped main breaker, a failed transfer switch, or a problem at the pedestal. We trace the power path from inlet to panel to identify the issue.

Need help with 12v & 120v electrical?

Give Phil a call or send us a message — we'd love to help.

Our Diagnostic Process

Electrical diagnosis in an RV requires specialized knowledge and equipment. Our process is systematic and thorough:

We start with a full system assessment — checking shore power input, transfer switch operation, converter output, battery voltage and state of charge, and all circuit breakers and fuses.

Using multimeters, we measure voltage at multiple points to identify drops. Load testers verify battery capacity under real-world conditions. Thermal imaging reveals hot connections and overloaded wiring that aren't visible to the naked eye.

We check every ground connection — poor grounding is one of the most common and most overlooked causes of RV electrical problems. We also verify polarity at every outlet and test all GFCI circuits.

Battery & Solar Upgrades

Want more power for boondocking or full-timing? We design and install complete battery and solar systems tailored to your power needs:

Lithium battery upgrades: We install Battle Born, SOK, and other lithium-iron-phosphate (LiFePO4) banks that provide 2-3x the usable capacity of lead-acid at half the weight. We handle all the wiring, BMS integration, and charging profile adjustments.

Solar installations: Rooftop panels, charge controllers (MPPT or PWM), and wiring — sized correctly for your battery bank and power consumption. We also install Victron complete systems for monitoring and control.

Inverter upgrades: Need to run household appliances off-grid? We install pure sine wave inverters sized for your loads, with proper wiring and overcurrent protection.

Safety & Code Compliance

Electrical problems in RVs aren't just inconvenient — they're dangerous. Loose connections, corroded wiring, and overloaded circuits cause RV fires every year.

Every repair and installation we perform follows NEC (National Electrical Code), RVIA standards, and manufacturer specifications. We use properly rated wire, correct overcurrent protection, and appropriate connectors for every application.

We also check for common safety hazards during every service call — reverse polarity, open grounds, missing bonding, and improperly modified wiring that previous owners or unqualified technicians may have left behind.

Pricing & What to Expect

Our labor rate is $150/hour. A one-time $75 service call fee applies on your first visit only — that includes a thorough electrical diagnostic. From there, we provide a detailed, upfront estimate for any repairs, upgrades, or installations needed.

Every connection is tested, every circuit is verified, and every job is documented. No surprises.

Proudly Serving the South Shore, Southeastern Massachusetts & Cape Cod

Based in Carver, MA, we provide mobile RV 12v & 120v electrical across Plymouth, Bristol & Barnstable Counties and surrounding areas.

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Frequently Asked Questions