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I am in the middle of fitting my new Kenwood DNX7240T.

I want to connect the "Handbrake Cable" (This is the cable that means that you can only use some of the functions ie DVD, Bluetooth etc when the car is stopped and the handbrake is on) so that it will always work.

Do I need to connect it to a live or earth cable?
It doesn't say in the manual and on Google it says to connect it to the earth. Can anyone confirm?

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