this is a diagram of a simple 12v relay.. if you supply pin C and D with 12v the A-B circuit will close and make the connection. So, if I assume that your LCD dome light is positive triggered, then you connect the WHITE/BLUE wire to pin A and C, BLACK/WHITE to pin D, and finally the YELLOW wire from your LCD to pin B. But I dont understand how can it stayed ON like u said.. a scan of the installation manual would be helpful
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