a.s.elliott(at)cox.net
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 Posted: Tue Dec 09, 2008 10:06 am Post subject: More debugging of alternator whine problem |
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I have continued the testing of the electrical system on my 601XL in attempts to reduce or eliminate the alternator whine. No luck yet. Here is what I have done so far:
[1] Ran radio off an isolated battery. No noise.
[2] Disconnected shield ground for headset wires. Noise persists.
[3] Disconnected power for headsets which runs along side the audio wires. (Thought this was a good candidate!) Noise persists.
Additional notes:
[4] Whine increases significantly in volume when adding power. Implies it is power related, not ground loop, yes?
[5] Noted that some Z-diagrams for permanent magnet setups show alternator control relay between alternator and regulator, and some show this between regulator and bus. Mine is the latter. Any reason to suspect this?
[6] Noted that for installation diagram of motorcycle voltage regulator, they show it connected directly to the battery. In my plane, the voltage regulator feeds the primary buss separately from the batteries. That is, there are two power feeds to the buss. Any chance that moving the connection from the regulator directly to the battery and removing the "extra" buss feed would have any effect?
Still hoping, and with a filter on order,
Andy Elliott, Mesa, AZ
N601GE,601XL/TD,Corvair
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