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  #11  
Old 08-23-2018, 11:49 AM
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This particular "forest of tabs" is designed for use in metal or plastic airplanes, hence the long thru bolt which would be necessary if you didn't have a metal firewall. Aeroelectric book shows the install for a plastic airplane, which uses the stud to the battery ground strap thru the firewall. While not necessary with a metal firewall, it sure can't hurt and makes for a very clean installation.
I put my tabs elsewhere and trust my airframe for ground with exceptions as called out by each component manufacturer.
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  #12  
Old 08-23-2018, 12:26 PM
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I have a suggestion: Label all the ground wires that you attach to that gizmo. You can thank me later
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  #13  
Old 08-23-2018, 12:57 PM
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Here's mine, all loaded up. The bolt goes through the firewall to tie to the battery ground point

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  #14  
Old 08-23-2018, 01:01 PM
Canadian_JOY Canadian_JOY is offline
 
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Quote:
Originally Posted by snopercod View Post
I have a suggestion: Label all the ground wires that you attach to that gizmo. You can thank me later
Where's the giant "LIKE" button when you need it most?!?!
Yup, knowing which ground wire does what is just as important as knowing which power wire does what. Sage advice there from snopercod!
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  #15  
Old 08-23-2018, 03:17 PM
BillL BillL is online now
 
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Quote:
Originally Posted by snopercod View Post
I have a suggestion: Label all the ground wires that you attach to that gizmo. You can thank me later
+1 and put it where you can get to it after you are nearly though phase I.
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  #16  
Old 08-23-2018, 05:44 PM
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I'm thinking of running another wire from the firewall battery ground to the subpanel and mounting the grounding block on the subpanel where it should be easier to get to. Any reason not to do this?
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  #17  
Old 08-23-2018, 06:47 PM
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That's a fairly common practice. To really eliminate the risk of ground loops, some of us isolate that 2nd ground block from the airframe and run a fat ground wire back to the primary forest of tabs. One technique for the subpanel ground block (which typically has only low current stuff attached) is to use a female subD connector with all the pins soldered together. A male subD housing made for removable pins is screwed to the chassis-mounted female, and each ground wire gets a crimped male pin. Very small & light weight.

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  #18  
Old 08-23-2018, 10:02 PM
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Quote:
Originally Posted by Av8torTom View Post
I'm thinking of running another wire from the firewall battery ground to the subpanel and mounting the grounding block on the subpanel where it should be easier to get to. Any reason not to do this?
I did this exact thing. My forest of tabs was "too big" so I cut it. 2/3rds on the firewall and 1/3 on the back of the panel, with a good tie from it to the mother on the firewall. As long as you have a solid tie back to your single point ground, you should be good.
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  #19  
Old 08-24-2018, 12:22 AM
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Quote:
Originally Posted by bruceh View Post
This is what it looks like in my installation.
I put my FOT in nearly the same location on my RV-9A as Bruce.

But mine is a slider, so I'm not looking forward to the footwell yoga that will be needed to trace future ground issues when and if required.

I'd locate it lower on the firewall if I did it over again.
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