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Date: Wed, 03 Aug 2005 18:36:27 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Leaking fuel hose
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Try the aeroelectric connection web site. (don't have the link handy or 
I'd include it.)

A much more effective (& cheaper) indicator is to measure voltage 
between the + terminal stud of the starter & the ground post of the 
battery while cranking the engine, then between the + & - battery posts 
while cranking. If there is a significant difference in the 
measurements, then there is a high resistance somewhere in the path from 
battery to starter. If that pair looks good, measure between the case of 
the starter & the - battery post. If you see any voltage at all there, 
there's a problem in the ground return to the battery.

The problem with using 'enhanced' low resistance ohm meters is that the 
resistance where the probes touch the circuit can be a significant % of 
the measured resistance. If you put the circuit under a high current 
load like cranking, you'll see significant voltage *drop* at the starter 
+ or significant *voltage* at the starter - if the problem is in the return.

I doubt the above makes much sense but I'm typing in a hurry while 
packing to leave on vacation & my wife is questioning my priorities.

Charlie

Bob Perkinson wrote:

>Some place in the archives of this list or the Matronics list is a diagram
>on how to make a simple reliable and fairly cheep ground tester that will
>test how well the ground paths will function.
>
>(looking but not finding at the moment)
>
>Bob Perkinson
>Hendersonville, TN.
>RV9A N658RP Reserved
>If nothing changes
>Nothing changes
>
>
>
>
>-----Original Message-----
>From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
>Behalf Of Dale Rogers
>Sent: Wednesday, August 03, 2005 11:51 AM
>To: Rotary motors in aircraft
>Subject: [FlyRotary] Re: Leaking fuel hose
>
>
>John,
>
>   What is a "weak" ground?
>
>   Any high-resisitance connection (including too small a
>cross-section for the current being passed) will encourage
>current to flow through another, lower resistance, path.
>
>   Gotta wonder why that particular spot got hot, though.
>Seems like the heat would be distributed along the entire
>braid.
>
>Dale R.
>[notice you got more responses here than on the CAF?  ;) ]
>