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Dave: Thanks for the education. I've been reading all I can find on the noise. Yours is the best I've got. Here is the basics of what I've read. If the noise changes with load it is coming from the voltage regulator. If the noise changes with speed it is coming from the alternator. Mine changes with the load. If I add lights the noise gets louder. Two point you made, can you clear my muddy water a little more, please? >Another source of alternator whine is called a "ground loop". To complete the charging path of battery, manufacturers connect the negative side to the airframe. The circuit is completed through the engine mount, engine, and grounding braid from the engine to the airframe. When avionics are grounded to the airframe at random, part of the airframe path for the charging circuit is common to the avionics power circuit. Thus, the noise is induced into the ground side of the avionics power wiring. I understand what you are saying here, but don't see how to prevent this. Should the ground for the avionics be taken to the battery ground point? > It is possible to get charging system noise from a generator, too but the frequency will be higher because of the higher commutation rate and more easily filtered by the battery. Here's a odd ball one - I've melted the wire on two noise fillters that connect to the alternator. This is why I think I may be put out AC. The gauge would peak and then return to normal. After I checked the fillter would be melted. Thanks again for the help. Jack __________________________________________________ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ____________________________________________________________ T O P I C A -- Learn More. Surf Less. Newsletters, Tips and Discussions on Topics You Choose. http://www.topica.com/partner/tag01
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