Quote Originally Posted by kurukato View Post
Hey guys,
I drive a 2004 Grand Prix GTP and I am looking to install a new head unit. I know I will need a new harness (the door chimes and existing functionality of the cars accessories would be ideal) and I need to know what kind I should get, I have been looking at the GMOS-04, and I was wondering if anyone has used this to install a new HU before. And if not what harness should I consider? I also am concerned because this harness has 4 RCA male plugs that connect the speakers to the HU, and my new HU only has 2 for the S/W would it be ideal to solder female RCA jacks to the speaker wires on the new HU to connect the speakers.

Thanks for the help,
Evan
I drive the exact same car and about a week ago had the exact same question. I went on crutchfield.com and ordered a new headunit to replace the stock monsoon headunit and ordered the GMOS-04 along with it. Now yes you have to have a headunit with 3 sets of rcas because the gmos uses 2 sets not counting the subwoofer output rcas (i believe) I was worried at first about the installation because the wiring harness is a little intimidating but it was actually the easiest install i have ever done. Took a solid 45 min start to finish and it works like a charm! The dinging is a little annoying but the GMOS has an adjustable level for it so you can turn it down if needed.