hi i just got a new cb its a cobra 19dx IV and i use it as a base by hooking it up to a dc13.8v 3amp switching power supplt i was wonderin do i still have to ground the radio even thoufh the power supply plugs into a three prong outlet if so plz tell me were to connect the ground wire. the power supply has two circular screw on of terminals so u loosen the terminal put in the wire and tighten the terminal