How to test portable generator stator for short in windings

Sounds like you have a dead short. Check the outlets for any debris, metal or copper. Check the backside if the outlet for anything grounding onto the unit. The breaker is tripping to protect the outlet and anything plugged into it. The fire shooting out of the outlet is an arc flash caused by the dead short. You can also try disconnecting and replacing the outlet . If the problem persists, disconnect the starter and try to bench test it with a multimeter. I hope this helps. Good luck.

Usually the cause of slightly low voltage like this is that the engine is not running at full operating RPM. Find the high speed adjusting screw on the govenor linkage and adjust the engine RPM until the output is 220V - 240V

Hi!

We have a put together a guide here to assist you in these situations. It will guide you through testing and repairing the Generator. : https://www.generatorguru.com/need-help/
If you need any further help our Generator Engineers are happy to assist you.

Regards,The Generator Guru Team

On a motor or generator, the stator is the non-moving frame or housing. The stator holds the stationary electrical windings.



The rotating windings are on the armature or rotor. The rotor is supported by and spins in ball or sleeve bearings that are on the end bells (or caps) of the motor assembly. Power is passed to them via brushes in the stator to slip rings or commutator on the rotor.

Hello; The Briggs engine front case is shaped to accommodate the internal mounting of the Alternator section. A service manual for this model would be very helpful. I believe you need to dismantle the back of the Alternator where the outlets are and then the outer case with the stator windings in it. This will leave the rotor ( the long shaft with windings on it ) which will be attached to the output shaft of the engine by some coupling device the you must dismantle. John

Hello, it sounds like either you have a voltage regulator failure, the rotating field coil is shorted or opened, or the exciter windings have failed. No easy answer because there are a number of issues here as you can see. Depending on how old the unit is you might have warranty. I would suggest you take it to a generac service center to have it checked out. I have 30 years experience with generac units. If it is a voltage regulator issue, (this can be expensive) you can get a jobber regulator. This link is for a good generic substitute. http://www.mcphersoncontrols.com/html/mcp_products/voltage_regulators/MTS63-4.html
I have used this regulator on 4000 watt to 50 kw units successfully. If it is a winding, then to rewind the stator part of the generator is expensive and a new generator is cheaper.
joe

Try removing the spark plug and rotating the engine by hand.
It could be just a little corroded from shipment over the ocean.
But once you have it loosened up and the oil circulated, it should start much easier.
Make sure it has oil in it, because sometimes they drain the oil before shipping.
You could also have someone else try the starter rope. A new engine can be hard to start.

http://www.partstree.com/parts/
hope this helps

As long as you have continuity through the stator and rotor windings, and no continuity from the windings to the core, you should be good.

If the brush block was replaced due to it being defective, take a look at the diode and capacitor regulator as well. Using a multimeter, the diode should indicate continuity in one direction, infinite resistance in the other. If you get this, then replace the capacitor. If not, then replace the diode, and likely the capacitor as well.

Check to see if this unit has brushes and rings. If it does, then make sure that the brushes are making a good contact on the rings. If the contact is good, then your voltage regulator could be bad. This would require more troubleshooting.