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Wiring advice

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marenyi(at)gmail.com
Guest

Posted: Wed Sep 26, 2012 6:54 am Post subject: Wiring advice

I have a question regarding wiring my Sonex/Great Plains VW engine. The system has 1 battery (PC625 Odyssey) a CD Solenoid, A regulator/rectifier, and a 3 phase 35 Amp alternator. I am using a MAG and a secondary ignition and coil system. Instrument panel is rather simple with a Stratomaster Ultra Horizon, and a Radio (not sure if I will use panel mounted or my Icom A-22 handheld). I may use a GPS, or might just use my ipad. I plan on installing a cigarette lighter power outlet or 2 and that is about the extent of the panel electrics. I have no lights. If I use the panel radio I will be mounting headset jacks on the panel as well and that might require me to use a ground isolation, even though it would be easier and probably more convenient to just ground straight to the firewall without isolation.

    

 I was planning on grounding on the engine side with a bolt through the firewall (need isolators?) where the negative battery, engine ground strap, and alternator ground will attach. On the inside I wanted to use a forest of tabs, but I think I would rather bring a negative buss closer to the panel and locate it there. I also plan on running a positive buss close to the panel as well. I have reviewed the appendix from the book and none are really close to what I am looking for. I am trying to figure out the best method to do this and also avoid radio noise later as well. The fewer wires through the firewall the better. Aside from the main power and ground wire penetrating the firewall I will also have the CD Solenoid power wire, the starter solenoid wire

    

 Please offer any info/help you can.

  

 Thanks!

 Eric M.



  [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Sep 27, 2012 7:02 am Post subject: Wiring advice

 	  Quote: 	
		  If I use the panel radio I will be mounting headset jacks on the 

panel as well and that might require me to use a ground isolation, 

even though it would be easier and probably more convenient to just 

ground straight to the firewall without isolation.


	


  I do not understand this statement.



 	  Quote: 	
		  

I was planning on grounding on the engine side with a bolt through 

the firewall (need isolators?) where the negative battery, engine 

ground strap, and alternator ground will attach. On the inside I 

wanted to use a forest of tabs, but I think I would rather bring a 

negative buss closer to the panel and locate it there. I also plan 

on running a positive buss close to the panel as well.


	


   What are you calling a 'positive bus'?  Are you using

   breakers or fuses? The bus that distributes power to either of

   those devices is a component of their fabrication

   and installation.



 	  Quote: 	
		    I have reviewed the appendix from the book and none are really 

 close to what I am looking for. I am trying to figure out the best 

 method to do this and also avoid radio noise later as well. The 

 fewer wires through the firewall the better. Aside from the main 

 power and ground wire penetrating the firewall I will also have the 

 CD Solenoid power wire, the starter solenoid wire


	


 	  Quote: 	
		  

Please offer any info/help you can.


	


    Please review the grounding philosophies illustrated

    in Figure Z-15, View A



http://tinyurl.com/6m3bk8k



    and Chapter 5 of the 'Connection. Then let us know in

    what manner the techniques suggested present an

    extra-ordinary problem for the assembly of your

    airplane -or- do not meet new design goals.



    If you have a design goals issue, we need to understand

    what it is before well considered advice can be offered.

   Bob . . .

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