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Generator Testing

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RichardR

02-22-2008 12:20:26

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Can anyone tell me how you run a generator as a motor to test it. I remember doing this many years ago, but have forgotten how. Thanks

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John T

02-22-2008 14:19:35

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Re: Generator Testing in reply to RichardR, 02-22-2008 12:20:26

This was taken from my Troubleshooting Procedure for testing gennys and voltage regulators, hope it answers your question.

8. MOTOR TEST. You can Motor test the Gen. If its grounded and you remove the belt and apply hot battery voltage direct to its ARM Post and have the Field Post dead grounded to frame, it should motor n run well (Armature n Brushes and Commutator likely okay). Then, if you next remove the Fields ground and it speeds up some, the Fields probably good. If it passes both those tests, it should charge, and if not, it may be a wiring or battery or Voltage Regulator or ligth switch controller or grounding problem. The hot battery voltage may be taken off the VR"s BAT terminal or the hot ungrounded battery post itself for this test.

If the bushings are worn so bad the armature drags up against the field poles and/or locks up dead magnetically n she wont spin at all you better get em fixed before you fry the armature

John T

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RichardR

02-22-2008 15:36:39

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Re: Generator Testing in reply to John T, 02-22-2008 14:19:35

It worked and the generator ran fine. One bearing was a little noisy, but otherwise okay. The folks on this forum are great!

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soundguy

02-26-2008 12:27:28

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Re: Generator Testing in reply to RichardR, 02-22-2008 15:36:39

It's a good thing you got lucky and had an A-circuit genny.

that test would not have worked on a B-Circuit genny as explained.

soundguy

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RichardR

02-22-2008 15:09:33

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Re: Generator Testing in reply to John T, 02-22-2008 14:19:35

Thanks, John T. That was what I was looking for. I will report back on my findings.

Richard

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