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 Topic: LED bulbs and blown fuses
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25/5/2021 at 3:58pm
Location: London
Outfit: Lunar Cosmos 524
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Joined: 17/9/2015 Diamond Member 
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Just checked on a Swift handbook, and much to my surprise too Colin21 (no road light fuses in my 2016 Lunar!) there is indeed a standard fuse box for road lights in the van!
If system normally OK with standard bulbs, then two scenarios come immediately to mind, as mentioned before, the LED bulb itself is shorting terminals in lamp fitting, the other is that the LED bulb pushes the moving contact at base of lamp holder further in than old filament bulb did, and this is causing a internal short within the lamp housing.
I suppose it's not completely out of the question that the new LED bulb itself is faulty with an internal short! Have you tried a different LED bulb in lamp?
Slightly off topic but relevant, to the best of my knowledge, retrofit LED bulbs are not legal on road lights! Retailers, at least the reputable ones, sell them with a disclaimer of "for internal or off road use only". There is certainly no shortage of them available, and no doubt in use, but unless it is 'E' marked (A capital 'E' followed by a number, all within a circle) then it's not approved for use on road lights, and as far as I know, none are, because I don't think the regulation even exists to approve them to, it's never been updated from filament bulbs! OEM lamps with integrated LED illuminators fall under different regulations and can be approved. Like most things, you've got to get caught first, but no defence if you are. I wish they were legal, I'd swap mine over.
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25/5/2021 at 10:27pm
Location: East Herts
Outfit: 1992 Elddis Wisp 450CT + X Trail
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Quote: Originally posted by Monty15 on 25/5/2021
Just checked on a Swift handbook, and much to my surprise too Colin21 (no road light fuses in my 2016 Lunar!) there is indeed a standard fuse box for road lights in the van!
If system normally OK with standard bulbs, then two scenarios come immediately to mind, as mentioned before, the LED bulb itself is shorting terminals in lamp fitting, the other is that the LED bulb pushes the moving contact at base of lamp holder further in than old filament bulb did, and this is causing a internal short within the lamp housing.
I suppose it's not completely out of the question that the new LED bulb itself is faulty with an internal short! Have you tried a different LED bulb in lamp?
Well that certainly comes as a surprise to me Monty15. I've never heard of that before and I really can't see the point. I wonder why they did that?
I'm inclined to agree that the LED bulbs are somehow causing a short in the fitting, and it is that which is causing the fuse to blow. Unless, as you say, the LED bulb itself is faulty.
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Best Regards,
Colin
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