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I had a similar question to you only a few weeks back...

Headlight Switch Relay
Started by
coopersmate
, May 30 2008 12:45 PM
19 replies to this topic
#16
Posted 04 April 2012 - 03:54 PM
#17
Posted 04 April 2012 - 04:50 PM
I think you are the only person who has ever offered praise for the search feature. Regardless, I'm glad this and other old threads help someone.
I find that if you type in the key words you need to find and then select to search in only the tiltles, not the content it works great.
I bought my relays today so ready to put in on the weekend. I agree with jimnali though this would be useful in the FAQ section as its a very clear description.
#18
Posted 14 October 2012 - 02:03 PM
right so in basic terms:
cut the blue/white wire coming out the bulkhead, put the relay in, then wire an earth wire in and thats it?
cut the blue/white wire coming out the bulkhead, put the relay in, then wire an earth wire in and thats it?
#19
Posted 14 October 2012 - 03:51 PM
NO! By doing that you are adding extra failure modes to the headlight circuit. What happens if the relay fails, on a dark twisty road at night? And, it does actually happen,especilly with cheap, nasty automotive grade relays. If you did the mod, YOU will be legally liable if you kill someone, and don't expect any help at all from your insurance company. Nor does putting a relay in help the other weak link, the dip switch.
If you are adding relays you will need FOUR of them, downstream of the dip switch, with at least seperate earths for the left and right pairs of relays. But you can then fit seperate left and right fuses (NEVER a single fuse in the headlight circuit, it is illegal and dangerous), each feeding the contact on the main and dip relays on that side.
While you are doing that, you should fix the downright unsafe Rover rats nest of wiring by connecting the left and right headlights each to its own earth bolt, not via the stupid wire back to the bulkhead which often fails and causes all front lights to fail, as well as causing additional voltage drop, which reduces light output. It was clearly some very junior and completely incompetent idiot that designed the Mini wiring, and at least every week on this forum there is someone with trouble due to that unsafe common earth return.
If you are adding relays you will need FOUR of them, downstream of the dip switch, with at least seperate earths for the left and right pairs of relays. But you can then fit seperate left and right fuses (NEVER a single fuse in the headlight circuit, it is illegal and dangerous), each feeding the contact on the main and dip relays on that side.
While you are doing that, you should fix the downright unsafe Rover rats nest of wiring by connecting the left and right headlights each to its own earth bolt, not via the stupid wire back to the bulkhead which often fails and causes all front lights to fail, as well as causing additional voltage drop, which reduces light output. It was clearly some very junior and completely incompetent idiot that designed the Mini wiring, and at least every week on this forum there is someone with trouble due to that unsafe common earth return.
#20
Posted 09 November 2020 - 04:32 PM
Hi I know I'm a johnny come lately, but I Have a question. If I only want a relay per headlight and don't have the dim dip switch. how can I do that? What wires go where?
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