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Black wire on side lights?


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Hi guys,


Just had a quick question about my side lights/front valance lights. I ordered a new pair as my old ones were rusted through. And I noticed on my old pair they had a black wire attached to them and the new ones that arrived didn't (see pictures below) What does the black wire do? I'm sure this is very simple but I'm new to electrics :P Thanks!








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yes as Ben says , the old has a dedicated earth the new relies on earth thro the body screws  never very reliable 

add the earth and you will be good for years 


if you dont need loads of terminals  and you have a  'RANGE' outlet near you they sell  crimp pliers and blister packs of  good crimp on terminals very cheaply.



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