RV Electrical Repair in Prescott

Most RV electrical calls in the Prescott area start the same way: the rig was fine, then it got plugged in somewhere new, or it came out of storage, 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 conditioner, 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, 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 we repair 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: worn contacts, failed relays, and the “works on the generator, not on shore power” pattern.
• Corroded 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 loads fighting for a 30-amp supply.
• Converters and chargers: batteries that never charge, lights that dim, a cooling fan that has quit, especially after a winter of sitting unpowered.
• Generators as a power source: since generators here run 15 to 20 percent under their rated output at altitude, we also check whether a “won’t run the AC” complaint is a generator sizing issue rather than a rig-side electrical fault.
• 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: campground site, storage lot, or rural driveway.

Why electrical calls here have their own pattern

Cold and moisture work on connections differently than heat does. A 30-amp plug or a battery terminal that develops a poor connection corrodes and loosens over a Prescott winter, especially if it has been exposed to snow or condensation, and that connection fails or arcs the next time a load hits it. A discolored or corroded plug end is not cosmetic; it is worth fixing before it causes a bigger fault.

Storage takes a toll on the 12V side specifically. A rig parked through winter without a battery maintainer commonly comes back with a bank too weak to run anything that draws real current, even if the panel lights still glow. That is covered in more depth on our batteries dead or not charging page.

Generators complicate the diagnosis at this elevation. Because a generator’s actual output here runs under its rated capacity, “the generator won’t run my AC” is sometimes a sizing or altitude-tuning issue rather than a wiring fault, and we check that before assuming an electrical repair is needed.

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 time the rig is plugged in, and over time they pit, corrode, 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 the AC starts; a buzzing or chattering sound from the compartment where the switch lives. We confirm it by metering voltage in and out of the switch, not by swapping it on suspicion.

What it costs

The same approach as every other job on our 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 we will always raise, whether or not you asked about them: a “hot skin”, where a missing ground and a fault to the frame can put voltage on the RV’s metal body (a tingle touching the rig and the ground at the same time means unplug at the breaker and do not touch the rig until it is tested), and anything that smells hot, a scorched plug, a warm transfer switch box, or a breaker panel with a burnt-plastic smell. Turn the pedestal breaker off and call.

Where we work

On site across Prescott, Prescott Valley, Chino Valley, Dewey-Humboldt, Williamson Valley, Paulden, and Mayer. Rural properties without a campground pedestal are common here; the appliance repair page covers converters and battery charging in more depth, and the AC repair page covers soft-start devices, which solve a lot of marginal generator-sizing complaints for less than any electrical repair.