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Old 10-05-2020, 16:01   #16
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Re: Alternator whine.

Measuring alternator whine. First, most inexpensive AC voltmeters donít actually indicate the correct voltage unless the AC is a good sine wave. So to measure the ripple, youíll need a meter which read True RMS. Second, based on the several articles I found, there doesnít seem to be a good agreement on how much ripple is "too much."

So Iíd probably try to find somebody that had the good AC meter. Theyíre much more common than an o-scope. If you read a few hundred millivolts of ripple, youíre probably OK. If itís several volts, then you can take the alternator apart to check the diodes.

When you install a new alternator, measure the ripple right then. It gives you a baseline for detecting future problems.
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Old 10-05-2020, 16:05   #17
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Boat: Compass 790 , 7.9 metres or 26 ft
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Re: Alternator whine.

Quote:
Originally Posted by Bycrick View Post
Measuring alternator whine. First, most inexpensive AC voltmeters donít actually indicate the correct voltage unless the AC is a good sine wave. So to measure the ripple, youíll need a meter which read True RMS. Second, based on the several articles I found, there doesnít seem to be a good agreement on how much ripple is "too much."

So Iíd probably try to find somebody that had the good AC meter. Theyíre much more common than an o-scope. If you read a few hundred millivolts of ripple, youíre probably OK. If itís several volts, then you can take the alternator apart to check the diodes.

When you install a new alternator, measure the ripple right then. It gives you a baseline for detecting future problems.
Ok thanks for that.
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