No you can not just ground that wire. In alpine units there is a sequence that has to be preformed each and every time you start the vehicle to get video. I'm assuming you have the foot brake lead hooked up yes? The parking brake should only have one wire coming off of it, just tap into that. Look up under the dash by the pedal and you'll see it. Either that or search ebay for "alpine video bypass" and you can find products taht will bypass it for you. But i repeat you can NOT just ground the wires.
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