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Jun 14th, 2026
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Joined: Nov 2011
Posts: 1,873 Likes: 174
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Nov 2011
Posts: 1,873 Likes: 174 |
Yes, the benefits of a mechanical dancing speedo needle, I'm so used to it...!
Ruut Bianchi
Morgan PlusFour 2023 Bentley Midnight Emerald
Morgan 4/4 4-seater 1990 Royal Ivory
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Joined: Apr 2014
Posts: 3,550 Likes: 5
Talk Morgan Addict
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Talk Morgan Addict
Joined: Apr 2014
Posts: 3,550 Likes: 5 |
I had a Benelli 250 lce in the 80s it's speedo used to wave at me anywhere up from about 20mph it handled really well though so I forgave it its funny habits like really fast indicators....
Mark - No Longer driving Archie the Old English Sheep Mog........... 2010 Roadster 3.0 V6 (S3) 
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Joined: Sep 2013
Posts: 158
L - Learner Plates On
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L - Learner Plates On
Joined: Sep 2013
Posts: 158 |
More than likely the bracket holding the transducer to the gearbox or faulty transducer I had the same problem. It turned out that the transducer had somehow rubbed off the flange being the gearbox (mine is a 2009 mode. I believe the transducer is behind the brake disc on later models?), or something got between the two and the contact face was damaged. Phil in Brands Hatch Morgan sorted me out with a new transducer ( after I sent the clock to Wales for testing to be sure) and it's 100% now. It does have to be positioned microns away from the flange of it will not pick up a signal and you will get an engine warning light as well. The Transducers are not cheap - €80 I think! G
Silver 4/4
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Joined: Aug 2013
Posts: 15,794 Likes: 15
Formerly known as Aldermog Member of the Inner Circle
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Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 15 |
OK so here is my eloboration.
As I said before it seemed that the speedo was getting current because the needle flicked when the ignition was turned on and the kilometers were showing on the display, but not updating. For this reason I did not suspect fuses.
This morning I went to the car to remove the dash to check for any loose wires but the only screwdriver I have with me is too big for the tiny screws that hold the plastic under-dash panel. I then noticed that some other dash functions and the fan were not working. Hmm! time to check the fuses. Naturally I checked about 10 before I found the culprit, a 2.5 amp fuse. Replaced the fuse, a miracle the speedo was now working. I turned on the fan, great that was working too. I changed the fan to high speed - phaff! Fuse blown. I replaced it again - same result.
So I can run the fan at low speed but until I pull the dash I can't use high speed. I suspect the problem may be that reported by another TMer; ie. that the back of the fan switch or the heater switch or somesuch has cut through the insulation on the fan wire, in this case the high speed circuit.
Anyway something to keep in mind: the fan, the warning lights, and the operation of the speedo are all on the same circuit. The lighting of the speedo, the display, and the start up flick of the needle when the ignition is turned on are on a different circuit. Peter, very interesting! I found out the expensive way (Recovery to Williams) that on the Roadster all the functions you mention are on one 5amp fuse and if it blows the engine also will not start. Not sure if it will continue running if already started. Yes, just one 5A fuse. I now carry a spare.
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Sep 2011
Posts: 14,748 Likes: 158
Member of the Inner Circle
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OP
Member of the Inner Circle
Joined: Sep 2011
Posts: 14,748 Likes: 158 |
In my case the engine ran fine but perhaps that is because I have an Omex ECU looking after all the engine functions. I still have not pulled off the dash to try to trace the short on the high speed ventilator fan.
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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Joined: Sep 2011
Posts: 14,748 Likes: 158
Member of the Inner Circle
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OP
Member of the Inner Circle
Joined: Sep 2011
Posts: 14,748 Likes: 158 |
A postscipt on this.
It turned out to be the printed circuit board that sits behind the centre of the dash.
Ultimately the section burned out completely and the handbrake light, battery light, and the cabin ventilation fan all ceased to work. Fortunately Borghi had one in stock despite the fact that failure of this component is very rare. Probably some small component had failed and with overheating had melted and shorted out a section of the board.
Peter
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