What does "open ground" on my surge protector actually mean?

That the safety ground connection from the pedestal is not intact. The RV may run apparently normally on an open ground, which is what makes it dangerous: the protective path that is supposed to carry a fault to earth is missing, so a later fault energises what it should not. Report it to the campground and move to another pedestal rather than bypassing the protector.

Is low voltage really a problem if everything still works?

Yes, and it is one of the most expensive slow failures in RVing. Motors and compressors compensate for low voltage by drawing more current, which makes them run hot, and they fail months later without the owner connecting it to the campground they stayed at. This is precisely what energy-management devices are built to prevent.

Why do my breakers trip only at some campgrounds?

Because the supply differs. A pedestal with a worn receptacle, a long undersized feeder, or a heavily loaded park transformer delivers weaker power, and appliances that start fine elsewhere cannot start there. The RV is the constant, so a fault that follows the location is usually the location.

Can I just use an adapter to plug my 50A RV into a 30A pedestal?

Physically yes, and the adapters are sold everywhere, but it halves the power available and you have to manage the load consciously — typically that means running one air conditioner and not much else. It is a supply limitation rather than a fault, and tripping the pedestal breaker in that configuration is the expected result of asking for more than the pedestal has.

Repair guide

RV electrical diagnostics

Whether the fault is at the pedestal, in the cord, or inside the coach.

The pedestal-versus-coach boundary, and what the specific fault names on an energy-management display actually mean. This is the only page here that treats the campground supply as a suspect in its own right, which is where a large share of RV electrical problems actually originate.

Stop-work system

Shore-power and 120V faults — including reverse polarity and open ground at the pedestal — can energise the coach frame. Disconnect and call a technician.

Nothing on this page is a repair instruction for this system. What follows is what to observe and record so a technician can work efficiently — the work itself is theirs.

What brings owners here

A surge protector or energy-management device refuses to pass power and shows a fault code
Breakers trip when a specific appliance starts
Some outlets are dead while others work
Lights dim noticeably when the air conditioner or microwave starts
You have felt a tingle touching the coach body or the entry step

What to observe and write down

These are observations, not repairs. Each one narrows the problem before anybody charges you for time.

01
Stop immediately if you have felt any tingle from the coach
A shock or tingle from the body, step or door handle means the frame may be energised, which is a lethal fault rather than an inconvenience. Disconnect from shore power at the pedestal, keep people and pets away from the exterior, and call a technician. Do not continue investigating.
02
Photograph the fault code on your surge or EMS display
These devices name the fault — open ground, reverse polarity, high or low voltage, or an open neutral. That readout is a real measurement of the supply and is the single most useful thing you can hand a technician.
03
Record voltage before and during the trip
If your display shows voltage, note it at rest and at the moment the problem happens. A supply that sags heavily under load and one that is steady point at completely different causes.
04
Note which breaker trips and what was starting
Whether it is the pedestal breaker or a breaker inside the coach, and which appliance was starting at that instant. A pedestal breaker tripping while a coach breaker holds is a different fault from the reverse.
05
Inspect the shore cord ends without energising them
With the cord unplugged at both ends, look for discoloured, pitted, or melted blades and a deformed or heat-marked plug body. Heat damage at a connector is a fire path. If you find it, that cord and that pedestal receptacle are both suspect and neither should be used again until checked.

How a technician works through it

Knowing the order matters: it tells you whether a quote skipped a step, and it tells you what a technician still has to establish before anyone can say what is wrong.

01
Test the pedestal independently of the coach
Campground pedestals fail, and they fail in ways that damage RVs — open grounds, open neutrals, worn receptacles and undersized supply. The supply is verified with the coach disconnected so that a park fault is not misdiagnosed as an RV fault.
02
Confirm the shore cord and any adapters
Cords and dogbone adapters carry the whole load through a small contact area and degrade with heat cycling. They are a frequent, cheap, and often-missed cause of both voltage drop and intermittent faults.
03
Separate the 120V AC and 12V DC sides
RVs run two independent systems joined by a converter or inverter-charger. Symptoms cross over — a failing converter looks like a battery problem — so establishing which side is actually at fault comes before component testing.
04
Load-test the circuit rather than the appliance
A breaker that trips on start is often responding to a supply or connection weakness rather than a faulty appliance. Testing under real load, at the point of failure, distinguishes the two.

What drives the cost

We publish no dollar figures anywhere on this site, because real prices vary by market, season, and technician, and a number we invented would look authoritative and help nobody. What is stable is what moves the number.

Whether the fault is in the park supply (not your repair at all), the cord, or the coach
Accessibility of the wiring run — faults inside walls, under floors or behind the converter cost far more in labour than in parts
Whether damage has already occurred downstream, since sustained low voltage takes out motors and compressors
Whether protective equipment is being added at the same time

Before you weigh any of that, settle who is paying. Warranty, insurance, or you works through the order that protects a claim — because authorising a repair before you have the answer is what turns a covered failure into one you funded.

Mobile or shop?

Electrical diagnosis is one of the strongest cases for mobile service, because the fault frequently involves the specific pedestal you are plugged into and cannot be reproduced anywhere else. A technician needs to see it where it happens. Rewiring inside walls or a full panel replacement may still need shop time.

Where this plays out differently

A handful of markets change the advice on this system rather than merely hosting it.

Orlando–Kissimmee, FL
Whether to diagnose several simultaneous failures individually, or to treat them as one event with multiple casualties.

Common questions

What does "open ground" on my surge protector actually mean?: That the safety ground connection from the pedestal is not intact. The RV may run apparently normally on an open ground, which is what makes it dangerous: the protective path that is supposed to carry a fault to earth is missing, so a later fault energises what it should not. Report it to the campground and move to another pedestal rather than bypassing the protector.
Is low voltage really a problem if everything still works?: Yes, and it is one of the most expensive slow failures in RVing. Motors and compressors compensate for low voltage by drawing more current, which makes them run hot, and they fail months later without the owner connecting it to the campground they stayed at. This is precisely what energy-management devices are built to prevent.
Why do my breakers trip only at some campgrounds?: Because the supply differs. A pedestal with a worn receptacle, a long undersized feeder, or a heavily loaded park transformer delivers weaker power, and appliances that start fine elsewhere cannot start there. The RV is the constant, so a fault that follows the location is usually the location.
Can I just use an adapter to plug my 50A RV into a 30A pedestal?: Physically yes, and the adapters are sold everywhere, but it halves the power available and you have to manage the load consciously — typically that means running one air conditioner and not much else. It is a supply limitation rather than a fault, and tripping the pedestal breaker in that configuration is the expected result of asking for more than the pedestal has.

Sources for the claims on this page

Open ground, reverse polarity, open neutral and out-of-range voltage are the standard fault conditions RV energy-management and surge devices are designed to detect and disconnect on.
Industry consensusCommon function set across RV surge protector and EMS products; industry consensus
A shock or tingle felt from the coach body indicates a possible energised chassis and is treated industry-wide as an immediate disconnect-and-stop condition.
Industry consensusIndustry-wide safety consensus; mirrored in this site’s safety gate for electrical faults

Related systems

Next step

Work through structured triage for this system and you will end up with a written service brief: what you observed, in what order, and what has not been established yet. It is the document that lets a technician quote properly instead of guessing on arrival.

Being straight about what this is. No technician is signed to any territory yet — not one. We do not match you, dispatch anyone, or promise a call. What you get is the brief, and a request form that copies it to us so we know the demand is real. If you need someone today, take the brief and send it to a local technician directly; it works just as well that way.

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