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The one situation where you will have to make a cut to your wiring is if you do not wish to have the radio delay circuit back feed into your fuse box's accessory circuit and power up other accessories. In this case Painless provides a diode (a device that restricts electrical flow in one direction). To install it, simply cut the stereo's key-switched power feed and install the diode so that it is between the Posi-Tap and the fuse box of your car, with the diode's stripe facing toward the stereo. You can see it installed in the previous caption.