Generator Runs but No Power at the Outlets

Part of our complete Small Engine Troubleshooting Guide.

Work through it in this order, cheapest first. If the engine will not run in the first place, that is a different list and our guide to a generator that will not start covers it. This one is for the machine that runs.

1. It Is Two Machines in One Case

A generator is an engine bolted to an alternator. The engine burns fuel and turns a shaft; the alternator turns that rotation into voltage at the panel. They fail separately and they are diagnosed separately.

So an engine that starts, idles smoothly and holds speed when you ask it for power has told you where not to look. Nothing in the fuel, the plug or the oil explains a dead outlet. Everything below is on the electrical side of that shaft.

2. The Breakers and the GFCI Come First

This is the answer far more often than anything expensive, and it is the step people skip because the panel looks fine at a glance. Switch the main breaker off and back on firmly. Then check each individual outlet breaker, which on many machines is a small push button rather than a lever.

Next, the GFCI receptacles. Generators live outdoors in exactly the damp conditions a GFCI is built to react to, and a tripped one looks identical to a dead one. Press reset and listen for the click. Then test with a lamp or a radio you know works, not with the appliance you were trying to run, because a failed appliance and a dead outlet look the same from where you are standing.

3. The Cord and the Load

The cord between the machine and the house is a real suspect and nobody suspects it. A long, thin cord loses voltage over its length, and a unit that reads fine at the panel can arrive at the far end too low to start a motor. Use the shortest, heaviest cord that reaches.

A cord with one broken conductor is worse, because it works on some things and not others. Swap in a different cord before you accept that the outlet is dead. Order matters too: bring the engine up to speed first, then switch loads on one at a time, biggest motor last. A refrigerator or a pump asks for several times its running draw in the first second, which is enough to trip a breaker you will then blame on the generator.

4. Check the Outlet You Are Not Using

Most panels carry two or three different receptacles: a pair of household outlets, often a twist-lock, sometimes a thirty-amp RV socket. They are rarely all on one breaker.

So plug your test lamp into every one of them with an adapter and see which are live. Household outlets dead while the twist-lock works is a breaker or a wiring fault inside the panel, which is cheap. Every single outlet dead on every breaker is the alternator, which is the next two sections. That one test splits the rest of the job in half, and it takes a minute.

5. Lost Residual Magnetism

If nothing at all is live, this is the commonest real cause, and it is the one that surprises people most. An alternator needs a small amount of leftover magnetism in its field to begin generating at all. Each run leaves a trace behind for the next one.

Sit a generator in a shed for a year or two without running it and that trace can fade until the machine cannot bootstrap itself. The engine runs, the shaft spins, the alternator makes nothing. It is not a broken part at all — but restoring the field properly means working on a live machine with the right equipment, so bring it to us rather than following a video. While it is here is also the moment to get the rest of the generator maintenance checklist done, and the habit that prevents it is running the machine under load once a month.

6. The Regulator, the Brushes and the Windings

What is left is bench work. The automatic voltage regulator holds output steady as load changes, and when it fails the machine either makes nothing or makes voltage that wanders enough to be dangerous to electronics. A brushed unit also has brushes and slip rings that wear and glaze, and those are a wear part like any other.

Behind those are the windings themselves, which is the one genuinely expensive answer and the last one to reach for. On a whole-home standby unit, though, check the transfer switch before any of this: a generator running happily outside while the house stays dark is usually the switch not transferring, not the generator failing to make power.

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Matching the Symptom to the Cause

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When to Call the Shop

Resetting breakers, pressing a GFCI, changing cords and testing every receptacle on the panel are all driveway jobs, and between them they account for most of the machines that get carried in here making no power. If one of them fixes yours, note which, because the same fault returns in the same weather.

Bring it to us when every outlet is dead on a healthy engine, when output wanders or reads wrong on a meter, when a breaker trips with nothing plugged in, or when the engine will not hold speed under load — that last one is an engine fault that looks electrical, and our guide to an engine that bogs under load covers it. We will tell you plainly what it needs and give a firm quote first.

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Generator No-Power FAQ

The engine runs fine but nothing works. Where do I start?
The main breaker and the individual outlet breakers, then any GFCI reset button. Test with a lamp you know works rather than the appliance you wanted, because a dead appliance looks identical.

Half the outlets work and half do not. Is that normal?
It usually means a breaker. Most panels split the duplex outlets and the twist-lock receptacle across separate breakers, so one dead group with another live group is a breaker story.

What is residual magnetism and why does it matter?
An alternator needs a trace of leftover magnetism to start making voltage. A unit that sat a year or more can lose it, and restoring it properly belongs on a bench rather than in a driveway.

Do you repair generators in Richmond, KY?
We do, across Madison County. Breakers and receptacles, regulators, brushes, windings and the engine side too, with pickup and delivery available and a firm quote before any work begins: (859) 661-8877.