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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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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
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For rear lighting issues and fuel pump they are all off rear harness drwg 3100114 this connects to main harness.
Via 13 pin connector dash board is connected via another subpar Ness so I'd still suspect a common return line
Last edited by milligoon; 17/08/14 06:57 PM.
Mark - No Longer driving Archie the Old English Sheep Mog........... 2010 Roadster 3.0 V6 (S3) 
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Joined: Aug 2013
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Formerly known as Aldermog Member of the Inner Circle
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OP
Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 15 |
I've just removed the dash and checked that all the connectrs are good and nothing I've been fiddling about near has come undone.
Main fuse is good, according to the multimeter.
I'll check the inertia switch. I had the car jacked up yesterday to replace the now repaired wheel/ture. I can't believe that jacking the car might do that, but you never know.
Everything works other than the instruments. And the car.
And before anyone asks I've tried both keys.....
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Aug 2013
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Formerly known as Aldermog Member of the Inner Circle
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OP
Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
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Colin,
there is no power to the inertia switch....very odd.
Peter
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Jul 2011
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Talk Morgan Addict
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Talk Morgan Addict
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I am with jbk check the crash button. On the plus 4 it is on the Uk near side near the bulk head.
Ian
2011 Plus 4
Wild Mogs Reims 2019, Goodwood 2018, Isle of Man 2017, Carried on to Caramulo" 2016
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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Cannot help you Peter but wish you luck!
Ruut Bianchi
Morgan PlusFour 2023 Bentley Midnight Emerald
Morgan 4/4 4-seater 1990 Royal Ivory
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Talk Morgan Addict
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Talk Morgan Addict
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Just been out and checked my car, on my own so no one to flick keys etc. Also it's a +4 but even so this circuit should be the same. OK there is no feed to the inertia switch with the ignition turned on either in mine, it is live on the purple wire when the engine is running but what I can't do is see if it's live during cranking (arms not that long). That suggests it's ECU controlled as a switched ECU output so yours may be perfectly OK. Please check if you have feed to the fuel pump direct at the pump block connector behind the spar wheel, I would suspect the answer is no. Step by step buddy, we will find it ;-)
Last edited by Spanner Juggler; 17/08/14 07:40 PM.
BR Colin
Who used to be a Spanner Juggler
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Joined: Dec 2008
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Talk Morgan Regular
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Talk Morgan Regular
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My Roadster failed to start shortly after getting it. Turned out to be the clutch pressure switch not working ( on the 3.7 Roadster, you have to depress the clutch before you can start ), but if I remember rightly, the instruments still worked, although being a Morgan, things may have changed...
Bypassing the clutch switch got me going again, although checking with a meter indicated that the switch was working. Strange..
Ian
3.7 Roadster
4" Ruston Procter SD Tractor
1905 Merryweather steam fire engine
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Joined: Aug 2013
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Formerly known as Aldermog Member of the Inner Circle
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OP
Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 15 |
Just been out and checked my car, on my own so no one to flick keys etc. Also it's a +4 but even so this circuit should be the same. OK there is no feed to the inertia switch with the ignition turned on either in mine, it is live on the purple wire when the engine is running but what I can't do is see if it's live during cranking (arms not that long). That suggests it's ECU controlled as a switched ECU output so yours may be perfectly OK. Please check if you have feed to the fuel pump direct at the pump block connector behind the spar wheel, I would suspect the answer is no. Step by step buddy, we will find it ;-) The fuel pump doesn't run. One of the solenoid valves opens, but the pump doesn't run. If the instruments worked as normal I'd suspect the pump or relay. It is the lack of activity on any of the gauges or warning lights that is very odd. Just realised none of the warning lights come on with the ignition. Hmm.
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Aug 2013
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Talk Morgan Addict
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Talk Morgan Addict
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Sorry Peter, I suspect it's a back to Williams job for their auto electrician to set to with his test kit, the advantage with a dealer is they can swap parts with a runner to try and move the fault (really good practice to move the fault rather than just get a car going then your 100% certain you have nailed the problem).
This is one of those that will be very simple open circuit, failed common earth point or something more serious like an ECU I am fearing, hope it's the former.
Please keep us in the loop if it's not too painful, all learning is good.
BR Colin
Who used to be a Spanner Juggler
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Joined: May 2011
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Drive on the Wild Side Part of the Furniture
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Drive on the Wild Side Part of the Furniture
Joined: May 2011
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Peter, I had a similar issue when an indicator bulb fitting on Rosie came loose and blew a fuse, this screwed the charging circuit and the fuel gauge and voltmeter did not work, if ignition light is dim then it's related to this I suspect. You may have a bad connection on the low tension side of the ignition circuit or failed circuitry in the alternator. Suggest you take the connecting block off the alternator and ensure all are clean and good connections, and try again. Then check other connections on this circuit. It's worth a try.
Adrian
Buggered Off, to a modern none leaky car, heart's still ticking
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