Electrical help - Heated screen

Hi All,



I have a heated front screen, I want to use a standard rear screen button. The standard button however seems to use a negative output, my relay setup (a land rover defender kit) uses a possitive to activate, can some one please help guide me with a method of converting my negative output to a possive?



I want to be able to still use the dash ilumination and 'on' light which is why I havent simply reversed the polarity on the switch ect.



Thank you

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