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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: Oct 2012
Posts: 313 Likes: 1
Learner Plates Off!
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Learner Plates Off!
Joined: Oct 2012
Posts: 313 Likes: 1 |
How can you easily test a fuse and be sure it is okay, or not okay?
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Joined: Aug 2013
Posts: 3,383 Likes: 14
Talk Morgan Addict
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Talk Morgan Addict
Joined: Aug 2013
Posts: 3,383 Likes: 14 |
Some have a small window in the back of the blades plastic and if you have a test lamp with a fine probe you can check for feed on either side, you would have to check which are permanent lives and then live in the different key positions or just put the ignition on. Otherwise remove the fuse and use an Ohms meter (the buzzer on some test meters) for a reading.
BR Colin
Who used to be a Spanner Juggler
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Joined: Dec 2009
Posts: 1,004 Likes: 31
Has a lot to Say!
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Has a lot to Say!
Joined: Dec 2009
Posts: 1,004 Likes: 31 |
Great the problem is located!
Remains the question if also the root cause was a faulty degraded fuse, or is there a real electrical issue in the circuit the fuse guards?
Was the blown fuse the disease or a sympton?
Kind Regards,
Bert
2025 Plus Six - 1909
2009 Roadster
1983 4/4 4str
Board member Morgan Sports Car Club Holland ('21)
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Joined: Dec 2008
Posts: 534
Talk Morgan Regular
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Talk Morgan Regular
Joined: Dec 2008
Posts: 534 |
If the fuse tested OK, I'd say it was an iffy fuse, not a blown fuse. Something as simple as a dry joint or a bad crimp.
Ian
3.7 Roadster
4" Ruston Procter SD Tractor
1905 Merryweather steam fire engine
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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 |
You can buy indicating fuses that light up when they blow, maybe something to consider?
By the way which fuse was it?
Mark - No Longer driving Archie the Old English Sheep Mog........... 2010 Roadster 3.0 V6 (S3) 
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Joined: Jul 2007
Posts: 28,911 Likes: 354
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,911 Likes: 354 |
Good news Peter... 
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW
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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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OP
Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 15 |
Great the problem is located!
Remains the question if also the root cause was a faulty degraded fuse, or is there a real electrical issue in the circuit the fuse guards?
Was the blown fuse the disease or a sympton?
Kind Regards,
Bert I was checking various unused connectors for a 12V feed using a multimeter. I guess it is possible that I shorted out two wires that resulted in a blown fuse: I'm not certain.
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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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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OP
Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 15 |
You can buy indicating fuses that light up when they blow, maybe something to consider?
By the way which fuse was it? Very much so. It was one of the small fuses, 5A and it powers the instruments.
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: May 2011
Posts: 4,896
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
Posts: 4,896 |
Peter, I have suffered exactly the same, which is what I was describing previously, I checked all fuses which looked ok, and tested ok, but a 10 amp on the low tension circuit had blown for the reason described. I resorted to Rosie beng rescued to the dealer who found it after an hour. Very embarrassing, so it either failed naturally or you blew it like mine I'd. 
Last edited by AJSki2fly; 19/08/14 10:26 PM.
Adrian
Buggered Off, to a modern none leaky car, heart's still ticking
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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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Blade fuses are great at hiding the fact that they have blown.
Been there on my other roady.
Mark - No Longer driving Archie the Old English Sheep Mog........... 2010 Roadster 3.0 V6 (S3)
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