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To: lml@lancaironline.net
Date: Sun, 07 Oct 2007 22:41:39 -0400
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From: Bill Wade <super_chipmunk@roadrunner.com>
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Subject: Re: [LML] Re: Electrical Issue
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  Grayhawk's comment reminded me of something- I had a new alternator 
that would drop off during climbout. I'd cycle the field breaker and 
that usually fixed it. Sometimes it would repeat. Once in cruise the 
alternator would function normally. I found that the shielded wire 
between the alternator and the regulator was grounded at both ends. 
Cutting the shield connection at the regulator cured the problem.

  Voltage sensing is in reference to ground- if the ground varies (stray 
voltage) it can also cause problems. In my case I think the shield 
provided an alternate ground path that differed from the primary ground 
connection.

  Where are the strobes grounded?   -Bill W


Sky2high@aol.com wrote:
> In a message dated 10/6/2007 11:19:56 A.M. Central Daylight Time, 
> marv@lancair.net writes:
>
>     I was wondering is some of you electrical gurus may be able to
>     pinpoint this
>     problem. When my system is under heavy load (night), i.e. landing
>     light,
>     interior lighting, strobes, navs, etc...all switches in the on
>     position, I am
>     getting cycling of my alternator. It will kick on and off
>     intermittently, and
>     sometimes trip my main breaker. The strobes seem to be the major
>     culprit. I
>     have gone through individual switches and it seems to be related
>     to the
>     strobes. I can get them to do this occasionally even during the
>     day with no
>     heavy load, just strobes and the usual amenities (radios, etc.).
>
>     Think I may have a corroded connection pulling too many amps? I'm
>     not sure
>     where to begin. Thanks for any input.
>
> Steve,
>  
> As Marv said, the battery may be weak and that only amplifies the 
> condition.  Another concern is where the regulator main bus voltage 
> sense is located.  Where is your voltmeter pickup on the main bus 
> located?  If the two are co-located, does the volt meter show abnormal 
> fluctuations?  Is it possible that the regulator sees such a low 
> voltage at strobe initiation that the regulator kicks out? 
>  
> Scott Krueger AKA Grayhawk
> Lancair N92EX IO320 SB 89/96
> Aurora, IL (KARR)
>
> Darwinian culling phrase: Watch This!
>
>
>
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