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depends on brand and unit, ie, my pioneer requires a double switch action, (grd, un grd, grd again) however my girlfriends alpine just needs to be grounded. in my girlfriends car I wired hers to ground always. in my car I have a simple rocker switch with the green lead on one terminal and a wire to ground on the other, allowing me to switch ground.
you can try touching the wire to pretty much any metal and see if that's enough, if its not (like with the pioneers) you may need a rocker switch, they can be have from auto stores or radio shack for $10.
edit:
there are also relay based automatic bypasses out there on ebay and such, I haven't messed with them, seem like a waste of money to me, but they probably work, and then you don't need to worry about switches.
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