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johnbright
Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA
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 Posted: Sat Oct 03, 2020 8:11 pm Post subject: field current supplied from B lead instead of from main bus |
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Hi Bob,
Someone in my sphere suggested getting field current from the B lead instead of from the main bus.
This way if the B lead shorts to ground and the fuselink opens, the field will be de-energized.
Marked up snip of Z101B attached.
Comments?
Thanks
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_________________
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
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user9253
Joined: 28 Mar 2008
Posts: 1924
Location: Riley TWP Michigan
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| Posted: Sun Oct 04, 2020 11:07 am Post subject: Re: field current supplied from B lead instead of from main |
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Bad idea. How often do "B" leads short to ground?
The "B" lead is not going to short to ground if properly installed.
Adding an extra wire from the alternator to the instrument panel increases the chances of a failure.
Suppose the alternator stops working for some reason.
It could be a broken belt, bad brushes, broken wire, blown "B" lead fuse.
The pilot will not know the cause. What action will the pilot take?
She might cycle the alternator field switch on and off. If the alternator still does
not work, she might leave the switch off to conserve the battery.
I see no advantage to adding an extra wire to the engine.
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