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Need a tips how best to validate wiring harness work

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david.nelson(at)pobox.com
Guest

Posted: Sat Nov 13, 2010 8:43 pm Post subject: Need a tips how best to validate wiring harness work

Hi Howard,



My avionics harness was professionally built.  I still did the pin-x should 

connect to pin-y and built up a schematic using the collected data.  I'm glad I 

did as they built the harness a little differently than what the EFIS vendor 

showed in their diagrams.  Still workable, just different.  Anyways, I think 

this potentially saved hours of debugging should the equipment have been plugged 

in and not worked correctly.



Also, for my sanity and ease of counting, I wrote the pin numbers on the front 

of every DB style connector.  This includes the connectors for the 430, SL-40, 

etc.  On any DB style connector that I assembled, I also wrote the pin numbers 

on the back.  Note that I didn't write every number down, I just wrote the 

numbers that represented the outboard pins. Reference the top/right picture of:



http://caura.dyndns.org/gallery/Panel/acr?full=1   (sorry - large image)



When all the avionics wiring was in-place in the panel, my Wife and I spent 

about 30 mins confirming the schematic to "as built" and updating as necessary. 

I'm relatively confident that the avionics will work when inserted and 

configured.  If things don't work, I'm confident that the schematic is accurate 

and will lead to a prompt resolution.



Overall, given your situation, I think you're on the right track.



Good luck,



 	 /\/elson



~~ Lately my memory seems to be like a steel trap .... without any spring.  ~~



On Sat, 13 Nov 2010, Howard M. Plevyak Jr. wrote:



 	  Quote: 	
		   Hi Folks,I'm a first time airplane builder and working on a GlaStar.  I'm at

 the point of instrument panel and electrical system installation.  I'm

 planning around the Z13/8 architecture and working thru the one system per

 page designs.

 

 I had an avionics shop wire up some of the panel wiring harness for a number

 of instruments (GNS430W, GRT EFIS, SL30, Trig Transponder TT22/TC20, and

 PS8000BT audio panel).

 

 My newbie question is around how best to validate the wiring work.   I have

 a multimeter tester and started to do continuity checks on all the D-Sub pin

 assignments....then I thought I'd ask here what's best/disciplined practice

 to use when checking out a pre-wired harness?  Is there a D-Sub pin test

 lead tool that make it easier / faster to check each pin assignment?

 

 I've setup a spreadsheet to capture all the connector type, pin numbers, use

 / function, FROM/TO information that I will then use to feed my schematic

 diagrams later.

 

 Thanks for any tips!

 

 Howard Plevyak

 Cincinnati, Ohio

 Glastar

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hplevyak(at)mac.com
Guest

Posted: Mon Nov 15, 2010 6:25 am Post subject: Need a tips how best to validate wiring harness work

David and Bob,Thanks for the tips on validating a wiring harness.  Good to know I'm on the right track.

Howard

Glastar, Cincinnati, OH

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