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Alternator Noise plus Volts & Amps Fluctuating

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kboatright1(at)comcast.ne
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Posted: Wed Jun 03, 2015 6:33 pm Post subject: Alternator Noise plus Volts & Amps Fluctuating

I had the opportunity to do a 7+ hour X/C a week or two ago and it was  driven into my head that I have a soft ~3 CPS noise in my headsets and the  voltmeter and ammeter readings are fluctuating at the same time and frequency as  the noise.  If I turn off the alternator, the noise goes silent and the  ammeter and voltmeter stabilize too.

  

 The ammeter shunt is measuring battery charge or discharge and the  voltmeter comes off of the buss downstream of the diode. Both gauges are analog,  and the needles are bouncing up and down by a half volt (13.5-14V)  and a  half amp or thereabouts.  The alternator is the B&C 40 amp unit and the  regulator is the Ford unit recommended 15 years ago when the airplane was  built.  All of the components have been in service for 14 years and have  approximately 950 hours of use on them.

  

 Any suggestions on rectifying this condition?

  

 Thanks,

  

 Kyle Boatright

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