Defender Headlight Wiring

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Originally Posted by Josh_WA

I used this one when I did mine as I did the driving lights and the headlights at the same time and also used the genuine LR switch.

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I am trying to do this on my Defender, but am finding that pin 5 on my switch seems not to "switch" at all. Any suggestions? I have wired as follows -

Pin 1 - S
Pin 2 - dash illumination
Pin 3 - nothing
Pin 4 - earth
Pin 5 - L1
Any ideas?