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Peter.Field(at)hgfield.co
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Posted: Sat Nov 24, 2012 2:41 am Post subject: Electrics

Does anybody know what retains the cables pushed into the terminal block (see photo)? The ignition circuit kill wires are the two white cables and we have had some trouble with these not making a good connection. There are rubber grommets that fit around the wires and appear to be the only means of securing a contact by applying pressure to the cable when fitted inside the block.

 

Peter Field. G-CHOX

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Sat Nov 24, 2012 4:28 am Post subject: Electrics

Hi! Peter, The grommets are to stop the ingress of water and maintain the wire central,  so mine are mounted vertically, perhaps that would help ?

I presume that you have a tang crimped to the wire which engages in the slot in the socket from memory?

Regards

Bob Harrison. 

 

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Peter Field

Sent: 24 November 2012 10:39

To: europa-list(at)matronics.com

Subject: Electrics

 

Does anybody know what retains the cables pushed into the terminal block (see photo)? The ignition circuit kill wires are the two white cables and we have had some trouble with these not making a good connection. There are rubber grommets that fit around the wires and appear to be the only means of securing a contact by applying pressure to the cable when fitted inside the block.

 

Peter Field. G-CHOX

  [quote][b]

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pjeffers(at)talktalk.net
Guest

Posted: Sat Nov 24, 2012 6:26 am Post subject: Electrics

Hi Pete,  

I can see from your photo that these white wires are not pushed fully home.  You will notice that each of the other wires in the plastic multi connector shows two black/dark coloured parallel strips just inside where they enter the connector block.  These are water seals.  If you now look at your two offending white wires these strips do not look the same because they are not fully pushed home.  

So the answer to your question is to push them further in.  You will find that they pop into place when in the correct position and should then look like the other wires.  

Give it a try,  think you will find this fixes your problem.  

   

Pete  

         

  

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Peter Field

 Sent: 24 November 2012 10:39

 To: europa-list(at)matronics.com

 Subject: Electrics  

  

   

Does anybody know what retains the cables pushed into the terminal block (see photo)? The ignition circuit kill wires are the two white cables and we have had some trouble with these not making a good connection. There are rubber grommets that fit around the wires and appear to be the only means of securing a contact by applying pressure to the cable when fitted inside the block.  

   

Peter Field. G-CHOX      

  

No virus found in this message.

 Checked by AVG - www.avg.com

 11/22/12  

       [quote][b]

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frans(at)privatepilots.nl
Guest

Posted: Sat Nov 24, 2012 10:10 am Post subject: Electrics

On 11/24/2012 11:39 AM, Peter Field wrote:

 	  Quote: 	
		   Does anybody know what retains the cables pushed into the terminal block

 (see photo)? The ignition circuit kill wires are the two white cables

 and we have had some trouble with these not making a good connection.


	


Apart from that they are not pushed fully home, as some others have

mentioned, I see a few more worrying things.

First, these wires should go to your ignition-switch and nowhere else.

But within a very short distance I see a screw terminal (which are

invented to connect lamp sockets to your house wiring - vibration free

-, but are totally unsuitable for car purposes, let alone aircraft

purposes), and some (soldered) connection within a shrink tube. Why is

there not just a straigth cable going to your ignition switch? This is

just asking for trouble, and it looks like your trouble already started.

The vast majority of electrical failures are due to bad connections, so

you should keep the amount of connections down to the absolute minimum,

and where unavoidable, use high quality connectors (and houshold screw

terminals do not in the least qualify for this).

Furthermore it looks like some bare metal wires are poking out of the

wires coming out of the screw terminal. I'm not sure what I'm seeing

here but if these metal wires are connected to the ignition wire, they

just have to touch anything and your ignition is killed.



To elaborate more on connectors: The problem with these screw terminals

is that they do not separate the electrical and mechanical connection.

An electrical connection (clamping) creates a stress point in the metal,

and any movement (vibration) focuses on this stress point using the rest

of the wire as a lever, quickly causing metal fatigue and unexpected and

unpredictable break of the wire. A good connector always has some way to

retain the wire upstream of the electrical connection, so that the

electrical connection point is absolutely free from any movement. (This

also applies to soldering: Any solder joint should be free from any

movement and vibration).

For connecting a lamp socket to your house wiring that screw terminal is

ok, because houses do not move or vibrate very often.



If you ever have a carb going bad and your engine starts to shake or

vibrate heavily, within a few minutes the wire will fall from the screw

terminal. When that happens, the wire will dangle down and if it touches

some metal it will kill the ignition.



Frans

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Mark Burton

Joined: 10 Jan 2006
Posts: 74

Posted: Sun Nov 25, 2012 12:56 am Post subject: Re: Electrics

Hello Peter,



If you want to remake those white-wire connections, I can supply you (for free) with the correct crimp terminals (male & female) for that Rotax connector.



Cheers,



Mark

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richard collings

Joined: 08 Jul 2011
Posts: 73
Location: warwickshire england

Posted: Sat Dec 08, 2012 5:40 am Post subject: Electrics

Hi Peter, I notice in your picture 2 simple cable  connectors are employed to join wires close to the Rotax connectors, I would  replace these with aircraft quality and tether them so they don't bounce around  with engine vibration. best regards 

 Richard

 37hrs still getting the hang of it  ! 

 [quote]   ---

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