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Jun 14th, 2026
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Joined: Apr 2012
Posts: 5,013 Likes: 32
Charter Member
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Charter Member
Joined: Apr 2012
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Most of my fillings have shaken loose driving the Morgan, I wouldn't be surprised if a relay had come loose from its moorings. 
+8 4.8
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Joined: Sep 2011
Posts: 14,748 Likes: 158
Member of the Inner Circle
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Member of the Inner Circle
Joined: Sep 2011
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Sometimes you get a bad contact on electrical components due to too high a resistance in contamination of the surface of contacts. I have never understood what it is but it used to be a common practise to clean the edge connectors on computer boards with a clean ink eraser before replacing a component. It is amazing how often it works. Since learning that trick I have removed and replaced motorcycle relays and ECU connectors two or three times to rub the contact surfaces together and ensure good contacts before rushing for a replacement.
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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Joined: Jun 2007
Posts: 859 Likes: 1
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Talk Morgan Regular
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Fretting corrosion is a form of accelerated atmospheric oxidation which occurs at the interface of contacting materials undergoing slight, cyclic relative motion. In electric contacts involving non-noble metals, fretting action can cause rapid increases in contact resistance, proceeding to virtual open circuits in a matter of minutes in the worst cases.
Now you know
Honda S2000
Lexus UX 250h
Toyota Auris Hybrid
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Joined: Sep 2011
Posts: 14,748 Likes: 158
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Member of the Inner Circle
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Very interesting. Thanks for that Neil.
I did some research on the topic and it is nice to know there is an explanation for what I have been doing. Seems it can be caused by even minute movement due to vibration or differences in thermal expansion.
It also makes me realise that there is a good reason for oiling the body joints (as recommended) on our Morgans. I wonder if that explains some of the corrosion and paint bubbling around fittings and joints, particularly on the Aero series.
Peter
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Joined: Jun 2007
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Talk Morgan Regular
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Talk Morgan Regular
Joined: Jun 2007
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I think you hit the nail on the head with regard to vibration. its probably more critical in a Morgan where the cars do tend to bounce around a fair bit. Perhaps the old fashioned method of screws on terminals is not such a bad idea. Of course it's less time consuming to have push in contacts when building a car. On the other hand it's much easier to change a component if required. The bubbling problems could be caused by a multitude of reasons including reactions to different type of metal. It's interesting that on a boat you have a sacrificial anode on the hull to stop corrosion. This I understand is caused by electron reactions. Not sure an Aero would look quite right with an anode trailing behind the car.
Honda S2000
Lexus UX 250h
Toyota Auris Hybrid
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Joined: Apr 2011
Posts: 8,646
Needs to Get Out More!
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Needs to Get Out More!
Joined: Apr 2011
Posts: 8,646 |
It's interesting that on a boat you have a sacrificial anode on the hull to stop corrosion. This I understand is caused by electron reactions. Not sure an Aero would look quite right with an anode trailing behind the car. This opens a up a whole new are for MMC to charge for on the extras list....
Giles. Mogless in Paris.
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Joined: Mar 2009
Posts: 3,824 Likes: 69
Talk Morgan Addict
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Talk Morgan Addict
Joined: Mar 2009
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I had a sacrificial anode bar in the door of my Triumph Herald in 1969. Unfortunately the whole car rusted away leaving only the doors! It took about 3 months.
nick
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Joined: Nov 2011
Posts: 1,242
Has a lot to Say!
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Has a lot to Say!
Joined: Nov 2011
Posts: 1,242 |
I think you hit the nail on the head with regard to vibration. its probably more critical in a Morgan where the cars do tend to bounce around a fair bit. Perhaps the old fashioned method of screws on terminals is not such a bad idea. Of course it's less time consuming to have push in contacts when building a car. On the other hand it's much easier to change a component if required. The bubbling problems could be caused by a multitude of reasons including reactions to different type of metal. It's interesting that on a boat you have a sacrificial anode on the hull to stop corrosion. This I understand is caused by electron reactions. Not sure an Aero would look quite right with an anode trailing behind the car. I'm with you professor  electrolytic reaction me thinks ?
Graham
Waking up is a good start to the day !!
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Joined: Jul 2007
Posts: 27,809 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
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I spray my critcal contacts every 2 years with contact cleaner when I also waxoyl the body.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Jun 2007
Posts: 859 Likes: 1
Talk Morgan Regular
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Talk Morgan Regular
Joined: Jun 2007
Posts: 859 Likes: 1 |
I spray my critcal contacts every 2 years with contact cleaner when I also waxoyl the body. That sounds extremely painful - Is it a know medical condition 
Honda S2000
Lexus UX 250h
Toyota Auris Hybrid
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