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Jun 14th, 2026
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Joined: Mar 2014
Posts: 1,737 Likes: 55
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Mar 2014
Posts: 1,737 Likes: 55 |
What a god dam nightmare. I think I have finally got to the bottom of it.
After 3 1/2 hours of disconnecting and tracing wires, belling them out, testing for insulation resistance I found a fault on the near side front indicator circuit which when disconnected at the under bonnet multi plug seems to cure the faults. Further investigation revealed the self tapping screw holding the lamp unit into the housing was longer than it should have been and had punctured the lamp unit and had shorted it out internally.
Removing the self tapper cured all the faults.
All I have to do now is reassemble the car as it's in bits all over the garage.
A large whiskey and a rub down with a damp copy of The Bulletin I think is in order.
Thank you once again for all your advice, much appreciated. That sounds like an epic diagnostic session but a simple fix. Well done! Something to check on your car Bob17?
Andy
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Joined: May 2015
Posts: 1,815 Likes: 32
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2015
Posts: 1,815 Likes: 32 |
...the self tapping screw holding the lamp unit into the housing was longer than it should have been and had punctured the lamp unit and had shorted it out internally.
Removing the self tapper cured all the faults.... Wow! So the TSM is OK too?
M3W5sp 2015, MSCC, MTWC, Oxon UK
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Joined: Mar 2013
Posts: 720 Likes: 21
Talk Morgan Regular
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Talk Morgan Regular
Joined: Mar 2013
Posts: 720 Likes: 21 |
Congratulations with finding the cause of this headache problem.👍
It shows that a stupid small screw which is already for many thousands miles on the car and never gave any problems suddenly can change in a nightmare.
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Joined: Aug 2019
Posts: 296 Likes: 3
Learner Plates Off!
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Learner Plates Off!
Joined: Aug 2019
Posts: 296 Likes: 3 |
You guys are my heroes. It gives me faith to keep going with my M3W which gives me so much joy, and you give me the ability to believe I can fix all its shortcomings.
2020 M3W
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Joined: May 2012
Posts: 1,796 Likes: 5
Talk Morgan Enthusiast
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OP
Talk Morgan Enthusiast
Joined: May 2012
Posts: 1,796 Likes: 5 |
TSM is tickety boo, I found that disconnecting it did not affect anything other than the indicators so why bother with it in the first place. Using an off the shelf indicator stalk and normal wiring would have worked equally well and probably less troublesome.
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Joined: Feb 2016
Posts: 8,672 Likes: 411
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,672 Likes: 411 |
Well done finding issue  I think the 5 speed M3W is a special case with electrics given the vibration especially at idle and thats without TSM consideration. I think latter contains the logic to inhibit rear fog unless headlamps on and maybe the dip/main toggle as units full title was headlamp and turn signal module. The only function I could find directly operated by stalk was the main beam flash. For this reason I always thought TSM interpreted other stalk functions as well. Alistair would give you the full list of its functions.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Jun 2012
Posts: 508 Likes: 1
Dreiradschubser Talk Morgan Regular
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Dreiradschubser Talk Morgan Regular
Joined: Jun 2012
Posts: 508 Likes: 1 |
Great job, well done, thanks a lot for learning more about our cars
Achim alias Waldemar
4 aircooled cylinders, 7 tires, not waterproof: my m3w Bluebelle (2013) and my 2CV Gundel (1990)
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