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Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14923
Experience:  Certified on Onan and Generac generators
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My 4000 watt generator all of a sudden quit producing 120

Customer Question

My 4000 watt generator all of a sudden quit producing 120 volts it dropped down to 4.8 volts please advice. Thanks Dave Stephenson, Mi.
Submitted: 1 year ago.
Category: Small Engine
Expert:  Hank F. replied 1 year ago.

Hello, my name is Hank.

What are the brand, model and serial numbers of the genset?

Customer: replied 1 year ago.
Generac 4000XL
Model: 09777
Serial #:(###) ###-####Rev No. 04
33 amps
Customer: replied 1 year ago.
Not sure if you received the info regarding the brand, model and serial #'s
Generac 4000XL
Model: 09777
Serial #:(###) ###-####Rev No 04
33 amps
Expert:  Hank F. replied 1 year ago.

At the voltage regulator, disconnect the 3-pin plug.

Start the genset, and measure the AC output at one of the 120V receptacles.

How much voltage do you get?

With the genset still running, masure the frequency of the AC output.

What frequency reading do you get?

Expert:  Hank F. replied 1 year ago.

Have you checked the voltage and frequency yet?

Customer: replied 1 year ago.
Attention Hank,I apologize for not returning your email. With my work, I haven't had time to try your suggestion regarding voltage and frequency.
I will try to get to it soon.Dave W.
Expert:  Hank F. replied 1 year ago.

OK

.