Had the same issue in the Disco. When you pull the switch apart you will find it has melted so no longer making contact. I was able to fix mine up enough to get it all working again. Thinking of putting in relays near the headlights to 1) save having the high current running through the switch and 2)improve the light performance with less voltage drop


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then fit a relay up near the battery near the Radiator should be room, Blue and white=High, Blue and Red= Low beam, wire as per instructions enclosed. The amperage from the H4's would have been the culprit

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