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What is the power wire, where does it go and what does it do?

The power wire supplies key on/off power to the GT tuner. This will allow the device to power on and off with key cycles. Install the power wire into a 10 to 15 AMP key power fuse. Find this fuse by probing with a test light, or voltmeter to see if it has power when the key is on and no power when the key is off this is an ok fuse to use. (You may notice a black ground wire in the power wire, this will not be used! The OBDII block will be your ground for the key on/off power.)