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Low Voltage on Magneto

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Kene1

Mechanical
Jul 18, 2012
14
The magneto we are using on our 12 cylinder Waukesha engine needs a voltage of 150-190 to enable the start-up. This mangeto was functioning properly until we had to shut down the compressor station for a period of 4 months. Now the voltage we are getting is 35V which is not adequate to cause ignition. Can a magneto go bad if left for some time and what could be the cause??
 
 https://files.engineering.com/getfile.aspx?folder=0b0e52b1-3545-455e-9efb-b8c19f654a3a&file=IMG_20210927_100507_mfnr.jpg
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