[thxext]

Thanks for the quick response. After a bit of testing with a multitester, I decided to try the standard aftermarket Metra harness. Good news is that everything works great. I am really not sure what that 3rd connector is for, but I will post a picture as soon as I can. Now to my 2nd issue. This nav unit would like me to connect to the car's spead signal. Any idea how I do that? All I have is a single wire that needs to be connected, but I am not sure where to start. The manual has little to offer. Thanks again for any help.