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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14439
Experience:  Certified on Onan and Generac generators
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My Generac model 01140-1, series PP5KA, SN(NNN) NNN-NNNNquit over

Customer Question

My Generac model 01140-1, series PP5KA, SN(NNN) NNN-NNNNquit over the weekend. No AC output. There is a 36uf capacitor (pt# XXXXX) in parallel with the excitation windings. The resistance across the terminals of this cap is 150 ohms using the R X 100 scale. I would think it should first show a short then go to infinity as the cap charges up. I got a newer service manual from Briggs & Stratton which show a different wiring diagram than my unit. It shows a bridge rectifier in parallel with both the excitation and the field windings. Do you think my cap. is bad? Could my unit be up date to the newer wiring configuration? Or should I junk the It? Thanks for your help.
Warren [email protected]
Submitted: 5 years ago.
Category: Small Engine
Expert:  Hank F. replied 5 years ago.

Thank you for choosing Just Answer for the solution to your problem.
My name is Hank, and I am going to assist you with this.


I have found using an ohmmeter to test a cap very unreliable - lots of false readings.

The best thing is to take the cap to an electrical shop and let them test it.


The cap is by far the most likely suspect, but there is also a varistor soldered into the windings of the rotor, and they have been known to fail fairly often.

But if you are not an experienced electronics tech, I would not suggest trying to desolder it yourself.


As far as replacing the set - that is totally up to you.

This is an older set, yes, but very basic - and usually reliable.


But then again, the newer sets are much quieter and more fuel efficient.


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