[Captain_Awesome_Pants]

Hope someone can help with this. I am having a strange voltage drop on the remote wire (dark green) that goes to my factory amp. I was attempting to use it as a remote cut-on for a camera but went a different direction when I started to detect the drop on the amp ( unit seems to be cutting off and on, music goes from tinny to full).

I checked it with a multimeter and sure enough its going from 12v to about 5v at intervals. I went ahead and cut the cable where I had made the tap and replaced it thinking that was the issue, but it continues. Im thinking its coming from somewhere further upstream.

Anyone have any ideas? Where does that cable ultimately lead up front?