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rcole927(at)earthlink.net
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 Posted: Fri Apr 10, 2009 12:36 pm Post subject: Ford alternator |
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Does a Ford-type alternator self excite? If not, how much battery voltage is needed to excite it?
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Roger Cole
rcole927(at)earthlink.net (rcole927(at)earthlink.net)
N76426
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sun Apr 12, 2009 6:14 pm Post subject: Ford alternator |
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At 03:34 PM 4/10/2009, you wrote:
| Quote: | Does a Ford-type alternator self excite? If not, how much battery
voltage is needed to excite it?
|
Don't know what a "ford-type" alternator is. There
are hundreds of part numbers for alternators have
have been used on Ford products most of which
behave like the majority of alternators since
day-one. They do not self-excite at normal engine
operating speeds.
However, at speeds typical of a belted Lycoming
installation I'm thinking that most alternators
will come on line without a battery. They only
need to see about 1 to 1.5 volts at the b-lead
terminal to come alive. This is a function of
residual magnetism in the field core, speed
of rotation and loads on the system.
Best advice I can offer is don't depend on it.
Bob . . .
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