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PROBLEM. Electrical Grounding with a primed airframe.

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psm(at)ATT.NET
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Posted: Thu Nov 22, 2007 1:52 pm Post subject: PROBLEM. Electrical Grounding with a primed airframe.

Hi Geoff,



The short answer is to run two cables from the battery to the engine 

compartment - positive and negative leads from the battery.   Then 

build your single point ground at the firewall some place.



Many people think using the aluminum structure for electrical ground 

is a problem anyway.  I think it is good for some things but not 

everything.  I wouldn't run the main starter circuit (the one with 

the heavy cables) through the skin.  However, I chose to run the 

return (ground) from my strobe light supplies through the wing 

structures.  For me it is a matter of how much current is involved 

and how often and how hard it switches.



I don't think the rivets would do a great job of connecting 

everything electrically.  If you want to know for sure you can use an 

ohm-meter (one of the functions on a cheap multimeter) to measure the 

resistance between any two points of interest.



Have fun,



Paul

XL fuselage

Retired electrical engineer

At 01:11 PM 11/22/2007, you wrote:

 	  Quote: 	
		  



I could use some advice or comment. Over the years, as I built my 

airframe I primed everything just before riveting/assembly. With the 

knowledge I have now that seems dumb. With the battery behind the 

passenger seat how can I ground it back there. All airframe parts 

are isolated from each other electrically. Will the rivets help me 

out? Would they give me the continuity I need? Do I need to run  a 

ground wire all the way back to the engine block?

           Lost in Lindenwold



912/dynon 180/icom-a210/garmin 296.

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Fri Nov 23, 2007 5:08 am Post subject: Re: PROBLEM. Electrical Grounding with a primed airframe.

Thanks Paul

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