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Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6680 ![]() ![]() ![]() |
Automotive relays are highly standardised - what you have fitted and the ones you have found on Amazon are generic Chinese-made low cost 40A relays.
There are however, two terminal layouts - called "Form A" and "Form B". Factory relays on a Defender are "Form B", from what I can find out, those H4458 relays are also Form B. So, any 4 pin 40A Form B relay will be a replacement. I would personally not fit a cheap Chinese-made relay as a replacement - but don't think you are UK based so won't link to UK suppliers. ![]() ![]() |
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big110 Member Since: 02 Nov 2016 Location: Pinner Posts: 365 ![]() ![]() ![]() |
Thank you for that! I can source Bosch here in the states...any other brands that are quality I should look at?
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Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6680 ![]() ![]() ![]() |
Bosch will be great. Just make sure they are "Form B": terminals 30 and 87 should be opposite each other, terminals 85 and 86 should be opposite each other:
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sako243 Member Since: 08 Jul 2014 Location: Wales Posts: 1246 ![]() ![]() ![]() |
Just a word of warning about the Bison kit. It only takes the trigger feed from one headlight which means if there's an issue with the wiring to that light it takes out both. The factory LR wiring has four fuses with four feeds to the headlights which means if a wire breaks to a headlight then it only affects that headlight.
I had a rather disconcerting moment losing all headlights at 60mph alongside Loch Cluanie in the Highlands in a storm. Due to the alternator location I'd used the passenger side headlight on the 300Tdi which had chafed a wire in the loom as it went around the bulkhead corner. Subsequently replaced with LED headlights and thus no need for the relays but it's gained the redundancy back of the original system. Ed 82 Hotspur Sandringham 6x6 95 Defender 110 300Tdi |
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big110 Member Since: 02 Nov 2016 Location: Pinner Posts: 365 ![]() ![]() ![]() |
Very grateful for that assist, martin! |
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big110 Member Since: 02 Nov 2016 Location: Pinner Posts: 365 ![]() ![]() ![]() |
Thats too bad. Red Bison has a great rep and I have not had issues before this relay issue. I do not prefer LED headlamps. I tested a number of manuafacturers and never found the light output of them to be what I was looking for. With this, I have been happy with uprated wiring and uprated bulbs in Hella housings. The redundancy is an interesting issue I will keep in mind but ultimatly happy to live with that risk. Bullbar and roof lamps for emergencies in my case ![]() |
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big110 Member Since: 02 Nov 2016 Location: Pinner Posts: 365 ![]() ![]() ![]() |
Martin, this is a Hella relay which doesn't specify Form B, but it doesn't say its Form A either...
Look like a good replacement? Assume Hella is not Chinese made especially at that price.. ![]() Click image to enlarge |
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Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6680 ![]() ![]() ![]() |
From what I can see when checking the part number, it is Form B.
However it is made in China, but to Hella quality/spec. I did say about avoiding the cheap Chinese (no-name) relays. ![]() ![]() |
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big110 Member Since: 02 Nov 2016 Location: Pinner Posts: 365 ![]() ![]() ![]() |
so much for German engineering! back to the drawing board. Ill find a bosch version I am sure!
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big110 Member Since: 02 Nov 2016 Location: Pinner Posts: 365 ![]() ![]() ![]() |
Martin, looks like I may need those UK suppliers links...coming up dry here! I can get this, made in Germany https://industrialtecsupply.com/collection...in-germany |
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