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		Douglas.Weir(at)us.calyon Guest
 
 
 
 
 
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				 Posted: Tue Feb 21, 2006 8:21 am    Post subject: Alternator light in a '79 Tiger | 
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				Gary,
 Can you please remind me what the alternator light on the panel is supposed
 to be telling me?
 
 I know that it comes on when the alernator side of the split master is
 switched OFF, but other than that, I have never seen it come on despite
 multiple alternator related problems.  FWIW, I have had the alternator
 replaced once (not sure what the problem was), I have had a broken output
 terminal another time, and had a broken wire from the VR to the alternator
 most recently.  None of these failures caused the ALT light on the control
 panel to illuminate, but each of them caused me to lose my alternator power.
 
 Thanks and regards,
 Doug
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		GrummanDude
 
 
  Joined: 15 Jan 2006 Posts: 926 Location: Auburn, CA
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				 Posted: Tue Feb 21, 2006 11:01 am    Post subject: Alternator light in a '79 Tiger | 
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				In a message dated 2/21/06 8:22:09 AM, Douglas.Weir(at)us.calyon.com writes:
  	  | Quote: | 	 		   Can you please remind me what the alternator light on the panel is supposed
  to be telling me?
 
  I know that it comes on when the alernator side of the split master is
  switched OFF, but other than that, I have never seen it come on despite
  multiple alternator related problems.=A0
 
 
 | 	  
 Oddly enough, it only tells you WHEN the alternator switch is on.   Other
 than that, it doesn't do anything.   Look at the wiring diagram on my web site.  
 You can see that it is wired (powered by) the nav lights.   I have had
 problems with the nav lights blowing a fuse and it turned out to be the idiot light.
  
 
 Completely remove all of the wiring associated with the idiot light and the
 over-voltage relay.   ALL of the wiring.   Install a Zeftronics alternator
 controller with the built-in over-voltage sensor.   Wire up the "I" terminal the
 way they show it in the STC paperwork (to one of the indicator lights for the
 Precise Flight vacuum gauge) and it will work just like the idiot light you=20now
 have.   It is a LOT simpler and doesn't use the nav lights for power.
 
 On a side note, just because the alternator light in a car tell you when the
 alternator is charging, that doesn't mean that aircraft have the same level=20of
 technology.   Oh, yes, I know, idiot lights for alternators on cars started
 showing up in 1963, BUT, they aren't approved for aircraft.  
 
 On my first Cheetah, I wired up an idiot light that showed when the
 alternator was putting out power.   I copied the wiring diagram out of a 1968 Motors
 Book (if you're old enough to remember that...) for a 1968 Ford.   It worked.  
 I had it in there for almost 15 years.   I took it out when I sold the plane. 
 I talked to an engineeer at Zeftronics and he said they were planning on a
 revision of the R15V00 regulator for which the "I" terminal also showed low
 voltage.  
 
 I think Bob Stewart has wired up the basic R15V00 to show low voltage but I
 never got a wiring diagram to see how he did it.  
 
 Maybe you can ask him.
 
 Gary
 
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  _________________ Gary
 
AuCountry Aviation
 
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