When wiring up my 9311 I noticed that Their was no ground wire coming from the harness from the CD player. I grounded the ground wire coming from the car to the chassis of the unit and it worked but i get the ground pop when changing from radio to cd/dvd. help. Also I do not have the blue and blue/white hooked up to any thing at the moment. I also have a dimmer ground wire coming from the harness from the car, this is not hooked up to anything and could this be the reason my sub does not work while on CD/DVD? thanks for the help.