You must be pretty handy with electronics to get it working in the first place. Wires always make me feel overwhelmed so I'd probably take it to a shop.Here it is. Just be aware that I fitted the door lights today and no matter what I do I can't get them to work. I'm waiting on a reply from them to confirm I haven't missed anything but even touching them to a car battery isn't firing them up. Frustrating but hopefully I'm missing something.
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Hope they get back to you soon and thanks for sharing the link.