10digits

I have installed a new Kenwood stereo in my '97 D1 4.0 V8. I bought a Metra adaptor kit (#70-9400) and it seems to have worked. Sort of. All speakers are working including subs in the rear but with the ignition on there is a loud ground hum. It also seems to be picking up the interference from the bluetooth. Has anyone else had a solution for this particular problem with aftermarket stereo replacements? If I need to run a new ground wire where should it run to and from?