Half your house goes dark while the other half stays lit, and the neighbors across the street still have power. That’s not a coincidence, and it’s rarely a tripped breaker. In most San Diego homes, that specific pattern points to an open neutral: a loose or corroded connection where the neutral wire meets your panel, your meter, or the utility’s service drop. It’s more dangerous than a normal outage, because the power still running through your house can spike well above 120 volts, and that’s hard on anything plugged in.
TL;DR
- Lights and outlets working in some rooms but not others, while neighbors still have power, usually means an open or loose neutral connection, not a tripped breaker.
- An open neutral can push some circuits to higher voltage than normal, which damages electronics, bulbs, and motors even while other circuits go dim or dead.
- Check your main panel first. If the main breaker and every individual breaker look normal, this isn’t a simple trip, and it needs a same-day electrician.
- Unplug sensitive electronics right away. Don’t wait for a fix to protect your TV, computer, or appliances from the voltage swing.
- The fault can sit on either side of the meter. SDG&E owns the service drop and meter; your electrician owns everything from the meter base inward.
- A loose connection repair often runs $185 to $425. Corroded service entrance wiring or a damaged bus bar can push the job toward $800 to $2,000 or more.
Why does half your house lose power while the rest stays lit?
Your home runs on a split-phase system: two 120-volt legs that share a single neutral wire back to the meter and the utility transformer. Big 240-volt appliances, like your dryer or range, use both legs together. Everything else, your lights, outlets, and most circuits, runs on just one leg or the other.
The neutral wire keeps those two legs balanced against each other. When the connection is solid, each leg holds steady at about 120 volts no matter what’s running on the other side. When that connection loosens, corrodes, or breaks, usually at the meter base, the panel’s neutral bus bar, or where the service wires land on the house, the two legs stop balancing. One leg can climb toward 180 or 200 volts while the other drops toward 60 or 80. That’s why some rooms end up with dim, flickering lights and dead outlets while others run fine.
This is different from a neighborhood-wide power outage in San Diego, where everything in the house goes dark at once and your neighbors go dark with you. An open neutral is selective. It hits specific circuits based on which leg they’re wired to, and it can come and go as the loose connection shifts with heat, vibration, or wind.
Is this actually dangerous, or just annoying?
It’s dangerous, not just inconvenient. The overvoltage side of an open neutral can burn out light bulbs in seconds, cook the motors in refrigerators and AC units, and fry TVs, routers, and computers that would otherwise shrug off a normal power blip. Appliances aren’t built to run at 180 or 200 volts for any length of time.
There’s also a fire risk at the source. A loose or corroding connection generates heat right at the point of failure, whether that’s inside your panel, at the meter base, or at the weatherhead where the utility’s line lands on your house. Our guide on warning signs of an electrical fire walks through what that kind of heat damage looks like before it turns into a bigger problem. If you notice a burning smell along with the partial outage, treat it as the emergency it is and read our burning smell guide for what to do in the first few minutes.
How do you know it’s not just a tripped breaker?
Start at your main panel. A single tripped breaker cuts power to one specific circuit, and the switch sits in the middle position instead of fully on. If every breaker looks normal and the main hasn’t tripped, you’re not dealing with a simple overload.
The real tell is the pattern. An open neutral typically affects circuits scattered across different rooms, not one contained area, because it follows which leg of the panel each circuit is wired to rather than a physical location. You might notice lights that are dimmer than usual, bulbs that flicker or burn out fast, or a mix of dead and working outlets in the same room. If you’re only missing power in one specific room or along one wall, that’s a more localized issue, closer to what we cover in outlets not working in one room.
What should you do the moment you notice it?
Unplug your electronics first. Computers, TVs, gaming consoles, and anything with a sensitive circuit board should come off the wall until this is resolved, since you don’t know which circuits are running high. Don’t keep flipping the main breaker on and off. Resetting it repeatedly doesn’t fix a wiring problem, and it risks more arcing at the loose connection.
Don’t open your panel cover or touch anything inside it. The voltages inside an open-neutral panel aren’t behaving normally, and that’s the wrong moment to start poking around without training. This falls under emergency electrical service, not a routine appointment. If it’s evening, our 24-hour electrician service covers exactly this kind of call.
Is this SDG&E’s problem or an electrician’s?
It depends on where the loose connection actually is, and that’s the first thing a diagnostic visit sorts out. SDG&E owns and maintains everything from the transformer through the service drop to the meter itself. If the open neutral is on the utility’s side of the meter, SDG&E handles that repair at no cost to you.
Everything from the meter base inward, the service entrance conductors, the meter can’s connections, and the panel’s neutral bus bar, is the homeowner’s responsibility and an electrician’s job. Most open neutral cases turn out to be inside the panel or at the meter base rather than out at the pole, which is why an electrician should handle the diagnosis first either way.
What does it cost to fix an open neutral in San Diego?
Most of these calls start with a standard diagnostic visit, $89 to $129, or $149 to $229 after hours, credited toward the repair. If the problem is a loose lug or corroded connection that just needs cleaning, re-torquing, and testing, the repair itself typically runs $185 to $425, similar to fixing a tripping breaker caused by a loose connection.
If the heat damage has reached the neutral bus bar or the service entrance conductors, the job gets bigger. Replacing damaged service wiring can run $800 to $2,000 depending on access and conduit length. In the rare case where the bus bar or panel enclosure is compromised, you’re looking at a panel replacement, which runs $3,000 to $8,000 in San Diego County. Your electrician should show you the damage before recommending anything past a simple repair.
Frequently asked questions
Why do some outlets work and others don’t, with no tripped breaker?
This is the classic sign of an open or loose neutral connection. Instead of one circuit losing power like a normal trip, you get a mix of dead, dim, and normal outlets and lights scattered across different rooms, because the fault affects one leg of your panel’s split-phase system. A licensed electrician needs to check the panel, meter base, and service connections to find where the neutral has failed.
Can an open neutral damage my appliances?
Yes, and it often does before anyone realizes what’s happening. The leg that spikes above normal voltage can burn out bulbs, damage electronics, and shorten the life of motors in refrigerators, AC units, and other appliances. Unplugging sensitive electronics as soon as you notice the pattern is the fastest way to limit the damage.
Is it safe to just wait until morning to call someone?
No. An open neutral is an active safety issue, not a wait-and-see problem. The loose connection causing it is generating heat right now, and the overvoltage side keeps damaging whatever’s plugged in for as long as it goes unfixed. Call an electrician the same day you notice the pattern, even if that means an after-hours call.
How is this different from a regular power outage in San Diego?
A neighborhood-wide outage takes down your neighbors too, and everything in your house loses power together. An open neutral is selective. Your neighbors keep their power, and your house shows an uneven mix of working and non-working circuits because the fault lives inside your home’s wiring or service connection, not out on the utility grid.
Will SDG&E fix this for free?
Only if the fault is on their side of the meter, meaning the service drop, transformer connection, or the meter equipment itself. If the loose or corroded connection is at your panel’s neutral bus bar or your service entrance conductors, that repair is the homeowner’s cost and an electrician’s job, not SDG&E’s.
Do I need a permit to fix an open neutral connection?
A simple loose-connection repair inside your existing panel usually doesn’t require a permit. If the fix involves replacing damaged service entrance conductors or any part of the panel itself, that work does require a permit and inspection, and SDG&E has to coordinate the meter pull and reset. Your electrician handles that process as part of the job.
When to call us
A partial power outage that leaves half your house running and half dark isn’t something to trace on your own. It sits right at the panel and service connections, where a mistake carries real risk. Bright Pro Electric diagnoses open neutral issues across San Diego County and tells you plainly whether the fix is on your side or SDG&E’s. Call (858) 988-5580 for a same-day diagnostic visit.