Onboard Systems
Transfer Switch and Shore Power Repair: Cost, Hours and Process in Hacienda Heights
Transfer switch and shore power repair addresses the hardware that decides where the coach gets its 120 volt power: the inlet, the cord, the automatic transfer switch and the surge protection ahead of it. A failing transfer switch is the most common reason a generator runs fine and the coach still has no power.
What brings this in
- Generator running normally with no 120 volt power reaching the coach
- An audible clack from the transfer switch that repeats or chatters
- Power that works on shore but not on generator, or the reverse
- A shore cord end or inlet that is warm or hot after an hour of load
- Scorching or pitting on the transfer switch contacts when the cover comes off
- A delay of far more than the normal transfer interval when switching sources
- One leg of a 50 amp service passing through the switch and the other not
- Surge protector reporting an open ground or reverse polarity at the pedestal
This job, by the numbers
$285 to $1,500
1 to 6 hours
In depth diagnostic, 1 hour at $285. One hour minimum. Credited to an authorized repair.
Parts and assemblies we work with
Progressive Dynamics, Furrion, Magnum, Xantrex, WFCO
What the transfer switch does and how it dies
An automatic transfer switch is a pair of contactors and a small control board. It watches for generator output, waits a set interval, then mechanically switches the coach from shore to generator and back. It is a simple device carrying the entire electrical load of the coach through moving contacts.
Contacts pit and carbon up over hundreds of transfers. Pitted contacts have resistance, resistance makes heat, heat accelerates the pitting, and the failure runs away with itself. The end state is a switch that either will not close on one source or closes with enough voltage drop that heavy loads misbehave.
The other failure is the control board, usually from heat or from a surge event. A board fault produces chatter, an endless transfer delay, or a switch that simply never recognizes the generator. Both symptoms send owners after the generator, which is running perfectly.
The inlet and cord end deserve equal attention
A 50 amp shore cord end lives a hard life. It gets dragged, stepped on, and plugged into pedestals with worn receptacles that no longer grip. Once a pin spreads or a receptacle loses tension, the connection arcs under load and both halves of the connection degrade.
That is why a hot cord end is a repair rather than an observation. Heat means resistance and resistance at 50 amps escalates. When we see a melted or discolored plug we inspect the coach inlet as well, because fitting a good cord into a damaged inlet reproduces the fault within weeks.
Surge protection belongs in this conversation. A quality unit at the inlet reports open ground, reverse polarity and low voltage before the coach's electronics find out the hard way, and it disconnects on a surge. Given what an inverter charger and a residential refrigerator cost, it is the cheapest protective hardware on the coach.
- Spread pins on the cord end from arcing at a worn pedestal receptacle
- Coach inlet contacts damaged by an already compromised cord end
- Pitted transfer switch contacts with measurable voltage drop under load
- Transfer switch control board failure from heat or a surge event
- Loose lug terminations inside the switch enclosure from vibration
- Missing or bypassed surge protection at the inlet
Cost, hours and the five minute test that saves a generator bill
The band on this page is one of the tightest in the program because the scope is narrow. Diagnosis is the in depth diagnostic tier at one hour and $285, credited against an authorized repair, and labor is the posted mechanical and electrical rate of $260 per hour across 1 to 6 hours.
The useful test is voltage at the transfer switch output while the generator runs. If the generator produces 120 volts at its own terminals and the switch output is dead or sagging, the generator is fine and the switch is the fault. That single reading has saved more than a few owners a generator repair they did not need.
Where the switch is replaced, we also read both legs at the inlet and inspect the cord end, because those three components fail as a chain. Replacing one and leaving a damaged partner in place is how the same complaint comes back in a month.
Scope
What this line item does not include
- Campground pedestal faults are the park operator's responsibility, not a coach repair.
- We do not diagnose shore power problems at a campsite or a storage yard.
- Chassis engine and alternator charging paths are outside this scope.
Being explicit about the boundary is faster than discovering it at pickup. If the work you need sits outside this line item we will say so at intake and point you at the right one.
Questions
Transfer Switch and Shore Power Repair questions
My generator runs but the RV has no power. What is wrong?
Most often the automatic transfer switch. It has to mechanically switch the whole coach load from shore to generator, and its contacts pit and carbon up over hundreds of transfers until one source will not pass. The test is voltage at the generator terminals versus voltage at the switch output. Good at the generator and dead at the switch output means the generator is healthy.
How much does an RV transfer switch replacement cost?
This is one of the tighter bands in the program. The part is moderate and the labor is 1 to 6 hours at the posted mechanical and electrical rate of $260 per hour, depending on where the enclosure is mounted and how much has to come apart to reach it. Lead time on the switch is 3 to 10 business days.
Why is my shore power cord end getting hot?
Resistance in the connection, which at 50 amps escalates quickly. Usually a spread pin from arcing at a worn pedestal receptacle. Once that happens the coach inlet gets damaged too, so we inspect and read both halves. Putting a new cord into a damaged inlet reproduces the fault within weeks, which is why we look at the pair.
Do I actually need a surge protector?
It is the cheapest protective hardware on the coach relative to what it protects. A quality unit at the inlet reports open ground, reverse polarity and low voltage before your electronics discover them, and it disconnects on a surge. Weigh that against the cost of an inverter charger, a control board and a residential refrigerator and the arithmetic is not close.
Related work
Often done at the same time
$285 to $5,000 plus
120 Volt Electrical Repair
AC side diagnosis and repair: shore inlet, breaker panel, GFCI circuits, receptacles and hardwired loads.
$400 to $8,500 plus
Generator Repair and Overhaul
Diagnosis and repair of a house generator that will not start, will not carry load or is throwing fault codes.
$750 to $4,500
Inverter and Converter Repair
Diagnosis and replacement of coach converters, inverters and combined inverter chargers, including transfer and cutoff settings.
$400 to $5,500
Wiring and Fuse Panel Repair
Harness repair, panel replacement and correction of prior wiring work, including rodent and chafe damage.
Get a firm number on transfer switch and shore power repair
The band on this page is honest, and the in depth diagnostic at 1 hour at $285 turns it into a firm number. One hour minimum. Credited to an authorized repair. We are 18.4 miles from Hacienda Heights.