# 120 Volt Electrical Repair: Cost, Hours and Process in Hacienda Heights 120 volt electrical repair covers the AC side of a coach: the shore power inlet, the main breaker panel, GFCI protected circuits, receptacles and the hardwired loads on them. It is the side of the system where a fault is a fire and a shock risk rather than an inconvenience, so scope discipline matters more here than anywhere else. ## Specifications - Price band: $285 to $5,000 plus - Shop hours: 1 to 20 plus hours - Turnaround tier: Systems and electrical - Insurance billable: no - Parts lead time: Breakers, receptacles and GFCI devices in stock. Panel and inlet assemblies 3 to 10 business days. - OEM brands: WFCO, Progressive Dynamics, Magnum, Xantrex, Furrion ## Why a coach AC fault is different from a house AC fault A house is a static structure with rigid conduit and terminations that never move. A coach is a vibrating platform with stranded wire, push in terminations and a cord that gets dragged across asphalt and stepped on. The failure modes that dominate are mechanical: a loosened backstab, a spread plug pin, a chafed conductor at a wall penetration. Heat is the tell. A connection with high resistance generates heat, and heat discolors plastic before it starts a fire. When we open a panel or a receptacle box on an intake and find browned insulation or a heat mark on a bus bar, that is the fault, whether or not it is currently misbehaving. The shore cord and the inlet are the two most abused components in the entire system. A 50 amp cord end that has been arcing at a pedestal for a season carries a spread pin, and the spread pin then damages every inlet it touches. That is why we look at both ends of the connection rather than replacing one. ## GFCI trips, and what they are actually telling you A GFCI is not a circuit breaker. It compares current out against current back and trips when a few milliamps are going somewhere else. It is doing its job when it trips, and the correct response is to find the leakage path, not to replace the device until one stops complaining. In coaches, the leakage path is usually moisture. Exterior receptacles, the wet bay, the bathroom and the refrigerator compartment are the usual candidates. A water heater element with a hairline breach in the sheath will trip a GFCI on heat and pass every test cold, which is a maddening intermittent until it is measured hot. The second cause is a shared neutral. Where a previous repair or an aftermarket addition tied a neutral to the wrong side of the device, the GFCI sees imbalance and trips even though nothing is faulty. Correcting that is wiring work, and it is common on coaches that have had an inverter or a residential refrigerator retrofitted. - Moisture in an exterior, wet bay or bathroom receptacle - A water heater element breached in the sheath, tripping only when energized - A neutral tied downstream of the device by a previous repair - A damaged extension or shore cord leaking to ground through a cut jacket - An aged GFCI at end of service, which does happen but is not the first suspect ## Cost, hours and the safety line we hold Diagnosis on this page is the in depth diagnostic tier: one hour at $285, credited against an authorized repair. Repair labor runs at the posted mechanical and electrical rate of $260 per hour. A receptacle, a breaker or a GFCI is often inside two hours. An inlet, a panel replacement or a rewire of a damaged run climbs to the upper end of the band. There is one thing we will not do, and it is worth stating. We do not close up a coach with a known AC fault deferred because the owner would rather wait. A 12 volt fault left alone is an inconvenience. A 120 volt fault left alone is a fire in a wood and foam structure with one exit. If the scope has to be phased for budget, the safety items go first and the cosmetic repair waits. Insurance rarely applies to a 120 volt repair itself, because the cause is normally wear or a prior installation. Where an AC fault caused consequential damage such as a burned compartment or smoke through the interior, that damage is a claim and we document it that way. ## Not included - We do not perform electrical work at a pedestal, a campsite or a storage yard. AC faults are bay work. - Park pedestal and campground wiring faults are the park operator's responsibility, not a coach repair. - Adding an inverter or a subpanel is an upgrade line item rather than a repair. ## Questions **Why does my RV GFCI trip as soon as I plug in?** Something on that circuit is leaking current to ground, and the device is doing exactly what it exists to do. In coaches the leakage is usually moisture in an exterior, wet bay or bathroom receptacle, or a water heater element breached in the sheath. Replacing the GFCI without finding the path just moves the problem and removes your protection while you wait for it. **Half my outlets work and half do not. What is that?** On a 50 amp coach that is almost always one lost leg. A 50 amp service is two 120 volt legs, and half the panel hangs on each. Lose one at the pedestal, at the cord end, at the inlet or at the main, and half the coach goes dark while the other half works normally. We read both legs at the inlet first, because that separates a coach fault from a park fault in about five minutes. **Can you replace the whole breaker panel in a coach?** Yes, and it is the right call when the bus bar shows heat damage or the panel is a discontinued unit with no available breakers. Most coaches carry a WFCO or Progressive Dynamics combination panel that includes the converter, so a panel job usually addresses the DC distribution and the converter at the same time. Lead time on the assembly is 3 to 10 business days. **My shore cord plug is melted. Do I need a new inlet as well?** Usually yes, and this is the part owners are surprised by. A melted or spread plug pin means the connection was running hot, and heat damages both halves. Fitting a new cord end into a damaged inlet reproduces the fault in a few weeks. We inspect and read both sides, and where only one is compromised we say so rather than selling the pair. --- Source: https://ocrv.club/rv-service/120-volt-electrical-repair OCRV Center, 23281 La Palma Ave, Yorba Linda, CA 92887 Phone (949) 799-3387. Email info@ocrvcenter.com. Serving Hacienda Heights and the surrounding area. 18.4 miles, 24 to 38 minutes via SR-60 west to Fullerton Rd, then south to La Palma Ave. In shop work only. All estimates are priced and credited against an authorized repair.