Thanks for the help.
I guess the ground is OK.
I try to find a wire for the dimmer.
I think I'll try the camera power from the back up lights. Closer to camera location and I don't think I'll use the camera other then for backing.
I thought that if the parking brake signal was grounded that you don't need the hack or grounding the mute wire with the 700 only the 900 and 90? If so guess I'll use the hack. Can anyone tell me for sure?
Thanks