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  #1  
Old 06-24-2011, 06:28 PM
Tram Tram is offline
 
Join Date: Sep 2007
Location: Florence, AL
Posts: 626
Default Lights?
Hey guys-

Getting ready to swap out my lights with HID's and today when I pulled the existing lamps out with H3 bulbs, I can find no ground wires? There is only one wire running to the bulb..

Is this normal? I have no idea what's going on here and AFAIK they were working fine when I pulled them..

Anyone?

Jeff
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  #2  
Old 06-24-2011, 07:12 PM
Ron Lee's Avatar
Ron Lee Ron Lee is offline
 
Join Date: Jun 2005
Posts: 3,275
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My guess is that the bulb case somewhere made contact with the aircraft frame for grounding.
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  #3  
Old 06-24-2011, 07:29 PM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Typically lights are grounded through the housing mounted to the airframe.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
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  #4  
Old 06-24-2011, 08:05 PM
Tram Tram is offline
 
Join Date: Sep 2007
Location: Florence, AL
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Ok, thanks guys..

While I'm here, since I didn't build this thing, can you guys tell me what the fasteners are called that are riveted to a structure and have a nut built in. What are these called?
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  #5  
Old 06-24-2011, 08:23 PM
D-Dubya D-Dubya is offline
 
Join Date: May 2009
Location: Beaumont, Texas
Posts: 156
Default Nut Plates
Nut Plates are what you're looking for. Van's, Spruce, and all the other aviation supply houses have them.
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David Welsh
Beaumont, TX
RV-7 N413WD
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  #6  
Old 06-24-2011, 08:32 PM
Tram Tram is offline
 
Join Date: Sep 2007
Location: Florence, AL
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Awesome. Thank you!
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  #7  
Old 07-07-2011, 10:48 PM
Tram Tram is offline
 
Join Date: Sep 2007
Location: Florence, AL
Posts: 626
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Quote:
Originally Posted by Mel View Post
Typically lights are grounded through the housing mounted to the airframe.
Any trouble shooting tips if I cannot "find" the ground for one of the lights?

I took a voltmeter tonight and turned on the lights. I was able to read ~12.6V through the landing light, however, through the taxi light, I was unable to find a ground for it.

Any thoughts?
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