Audio Systems: Car stereo and amp hook up, ground loop noise, gmc yukon

Question
I have a 1998 GMC Yukon with a stock delphi stereo with a cassette and an external cd player.I have 2 ten inche JBL's in a box with 2 300 watt jensen power amps,1 for the 10"ers and 1 for the stock system. I had this hooked up to my 85 cutlass and carefully took out the wiring from the to transfer to my GMC,There was only 3 wires that went directly from the amps to my radio,1 was a RMT (lite blue) wire that went to the radio,and a coax (red)/(black) that pluged into the radio itself which was another radio type. Do you know which wires those 3 go to in the back of the Stock radio. As in  the RMT wire and how to get the coax red and black wires to go into the radio that does not have that type of hook up? Thank you for your help!

Answer
The remote wire is a 12 volt "trigger" that tells the amps to turn on when you turn the cd player on.  the amps should be off when the car is off so that they dont drain your battery.  USUALLY the cig lighter only works when the key is in the "on" and "run" positions so I would test that and if so, just cut and splice the posative wire there to your remote wires.
As for the coax lines you will either need to use the "high level inputs" if your amps have them or get a high level converter.  either way I have found these to by noisy (enine noise and ground loop noise).  try them out to see what happens.  If your amps have a high level input, just splice the wires going to the rear speakers and connect them here, this will use the spakers as the amps input instead of the coax.  if there is no high level input, you can get a converter like this one:

http://www.crutchfield.com/S-LMAPP4zW8ou/cgi-bin/ProdView.asp?search=level+conve...

Good luck!