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In a message dated 3/13/01 2:40:24 PM Eastern Standard Time, [EMAIL PROTECTED] writes: > Now explain where the whin is > coming from. Is it the Alternator or the Voltage Reg. > > I think my alternator will, sometimes, put out AC voltage The voltage is DC, in that it is never "negative," but it is rectified AC, which means it varies from zero volts to about 14 volts, rapidly. The battery is a big whine absorber, and generally does a good job. Resistance in the connections can result in some of the whine getting into the plane's electrical system, as can a failed or failing diode. There are 6; if one fails then there is a "missing bit" in the DC for every revolution of the alternator. Many alternator installations also have a capacitor on the alternator output to help eliminate the noise. The only way true AC can get into the system is if a diode fails by shorting. This is very uncommon, and undesirable, too. I expect the circuit breaker would pop if it did happen. JC __________________________________________________ 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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