RV Electrical Repair in Mesa

Most RV electrical calls in the East Valley start the same way: the rig was fine in storage, it got plugged in at the resort, and something does not work. Nothing at all, half the outlets, the air conditioner but not the microwave, or everything for ten minutes and then nothing. Almost all of it is findable with a meter in the first hour, and a surprising amount of it turns out to be outside the rig.

An RV runs two electrical systems side by side, and the first question on every call is which one has the fault:

• 120-volt AC: shore power from the pedestal (or the generator), through the transfer switch and the breaker panel, to the outlets, the air conditioners, the microwave, and the electric side of the fridge and water heater.
• 12-volt DC: the batteries and the converter that charges them, feeding the lights, the water pump, the furnace, the slide motors, the leveling jacks, and the control boards on nearly every appliance.

A dead 12V system makes the rig look dead even when shore power is fine. A dead 120V system leaves the lights on and the air conditioner silent. Telling them apart is step one.

What gets repaired on site

• Power drops when plugged in: pedestal testing, cord and plug inspection, surge protector and EMS diagnosis, and tracing the fault that trips the breaker.
• Automatic transfer switches: burnt contacts, failed relays, and the “works on the generator, not on shore power” pattern.
• Melted or scorched shore-power plugs and receptacles: cut back, re-terminated, or replaced with the right-rated parts.
• Dead outlets and GFCI chains: one tripped GFCI often kills several outlets that look unrelated, including outside ones.
• Breakers that trip under load: undersized circuits, a failing breaker, or two big loads fighting for a 30-amp supply.
• Converters and chargers: batteries that never charge, lights that dim, a cooling fan that has quit.
• Inverters on motorhomes and fifth wheels that have them: no output, faults, and the settings nobody told you about.
• 12V faults: blown fuses, corroded grounds, failed battery disconnects, and the loose cable that takes a slide or a jack down with it.

Everything is done where the rig sits: resort space, storage lot, or driveway.

Why “we lose power when we plug in” is so common here

The pedestal is under load too. East Valley resorts built decades ago were wired for a different generation of rigs. On a hot afternoon, with every site running one or two rooftop air conditioners, older park circuits sag. Compressors do not like starting on low voltage, breakers trip, and the rig gets blamed. Measuring the pedestal voltage at the time of day the problem happens is the first test that should be run.

Your surge protector may be working perfectly. Many owners run an energy management system (EMS) rather than a simple surge strip. An EMS watches the incoming power and disconnects the rig when voltage drops too low, rises too high, or the pedestal shows a wiring fault. That feels like a failure. It is the device protecting your air conditioner compressor from a bad supply. Most units show a code, and the code usually tells which side has the problem.

Heat is hard on connections. A 30-amp plug that has carried a full air-conditioning load all summer, with a slightly loose contact, gets hot. Heat raises resistance, resistance makes more heat, and the plug end scorches or melts. A discolored or melted plug is not cosmetic. It is the most common fire risk on a shore-power system, and it gets fixed before anything else.

Adapters stack up faults. A 50-amp rig on a 30-amp adapter, or a 30-amp rig through a dogbone into a 50-amp outlet, is fine when everything is sound. Every extra connection is one more place for heat and a poor contact, and a rig that runs everything at once on a reduced supply trips breakers by arithmetic, not by fault.

Transfer switches: the usual suspect inside the rig

On a rig with a generator, the automatic transfer switch decides which source feeds the breaker panel. When shore power arrives it passes straight through, and when the generator starts a relay waits for it to settle and switches over. The shore-side contacts carry the load every day of the season, and over time they pit, burn, and stop making a clean connection.

The symptoms are recognizable:

• Everything works on the generator, nothing works on shore power.
• Power flickers or drops when a big load like an air conditioner starts.
• A buzzing or chattering sound from the compartment where the switch lives.
• Scorching or a hot smell at the switch box.

Confirm it by metering voltage in and out of the switch, not by swapping it on suspicion. When it has failed, replacement can be done on the same visit if we have the unit on hand, and it is always done with the rig fully disconnected from both sources.

What it costs

The same approach as every other job on the pricing page: diagnosis first, then a number you approve before any work starts. If the pedestal turns out to be the problem, you pay for the diagnosis, not for a part.

The safety part

Two faults worth raising on every visit, whether or not you asked about them:

A “hot skin.” If a pedestal has a missing ground and the rig has a fault to its frame, the metal body of the RV can carry voltage. The warning sign is a tingle when you touch the rig’s metal and the ground at the same time. If you ever feel that, unplug at the pedestal breaker and do not touch the rig until it has been tested.

Anything that smells hot. Scorched plugs, a warm transfer switch box, or a breaker panel that smells of burnt plastic are not wait-and-see problems. Turn the pedestal breaker off and call.

Where the 12V side fits

Dead batteries, a converter that has quit charging, and a rig that only has lights when it is plugged in are covered in detail on the batteries dead or not charging page, including the checks you can run yourself first. The appliance repair page covers the water heater, furnace, and fridge control boards that depend on a healthy 12V supply. And if the AC is the load that keeps tripping things, the RV AC repair page explains soft-start devices, which solve a lot of marginal-pedestal complaints for less than any electrical repair.

Where this applies

On site across Mesa, Apache Junction, Gold Canyon, Gilbert, Chandler, Tempe, Queen Creek, Scottsdale, and Casa Grande. Resort spaces are where most electrical trouble shows up, and the space number, the pedestal amperage, and whether you run a surge protector or an EMS are the three things worth mentioning when you book.