A.O.A bro. I,m a bit confused regarding the wiring. I bought everything required for this setup. The problem is with the ground wire. The remote wire from headunit feeds into the left terminal of the transistor, and the output is put out from the right terminal to the positive 5volt to the modulator, and the middle one is ground. I wanted to ask what voltage would be the ground of the transistor ? would it be normal 12 volts negative ground of the car ? and what wire to attach to the ground of the modulator. Please help me eliminate my confusion regarding the wiring. Eagerly waiting for your reply. Thanks.