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Jun 14th, 2026
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Joined: Jul 2012
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Talk Morgan Enthusiast
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OP
Talk Morgan Enthusiast
Joined: Jul 2012
Posts: 1,616 Likes: 1 |
My 1992 (M16) plus 4 failed the MOT because of no main beam on drivers side head light. New bulb - no good, checked the fuse and this was OK but there is no voltage on the feed in the head light. I am trying to trace the wiring and I suspect a relay somewhere but can only find two, one being the fuel pump and one beside that which I swapped out for a spare on the off chance - no go. Has anyone had this problem or are there any ideas.
John
1992 plus4 connaught green
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Joined: Jul 2007
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Member of the Inner Circle
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Member of the Inner Circle
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On my 1994 car it was an earth problem. Wiring diagram is here http://www.gomog.com/allmorgan/plus4m16wiring.jpg
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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Thanks John, I have already printed off the wiring diagrams from gomog but it shows a dip/main box, could be a relay, but I can't locate. I will just have to track from back of no6 fuse. If it was a short to earth I would have expected the fuse to blow. I don't know just when the weather has got reasonable.
John
1992 plus4 connaught green
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Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
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Can't remember whether there was a relay on my '97 T16. May be worth asking Keith at BHM or Tim Ayres at New Elms?
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW
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Joined: Jul 2007
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Member of the Inner Circle
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Member of the Inner Circle
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Graham,
I can't remember either. I know with the poor earth the fuse didn't blow.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Feb 2012
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Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2012
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John, try the easy way, before you do anything run an earth from the bulb to a screw holding the headlamp bucket. If nothing else it will eliminate a bad earth. Both my lamps have earth flyleads fitted to earth this way, its easier than trying to trace a bad earth in the loom. A short to earth will usually blow a fuse but a bad earth will not, it just won't work.
1993 T16 +4 Lancia Blue.
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Joined: Jul 2007
Posts: 27,804 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
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And that is what I did when I had the issue
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Jul 2012
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Talk Morgan Enthusiast
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OP
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Thanks I will try that in the morning but what I can't understand at present is that the dim filament lights and it uses the same earth wire.
John
1992 plus4 connaught green
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Joined: Mar 2013
Posts: 970 Likes: 1
Talk Morgan Regular
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Talk Morgan Regular
Joined: Mar 2013
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Poor earth, I had the same problem also with a side light
good luck
Magwa
1950 Allis Chalmers B tractor
2000 Porsche boxster
2014 Skoda yeti 4x4 elegans
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Joined: Jul 2012
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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The earth is good. I have found a "black box" under the dash with 8 wires two of which are blue and white, the same colours as appear in the headlights. Continuity checks that the one lead to the good main beam gets voltage whilst the other not. A potted relay I think. Any ideas where to get a replacement.
John
1992 plus4 connaught green
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