I am installing a new head unit and have the wiring harness (2 connectors))with the preout plugs, my stock radio had 4 connectors one only had one wire to it. So what do I do with the other two plugs? I think i saw somewhere that you don't use all the wires.
My new radio has the 4 RCA outs.
2005 350Z convertible

 

are they possibly line outs to amp(s)?

 

It looks like I will will be using the 2 larger plugs with the kit plugs supplied. Not sure about the 2 other plugs like i said one only has one wire to it a yellow and red i think. The other has about 6 wires on it. The deck has the C/D and cassette.

 

Crutchfield has a link to the wiring for our car. Check it out. You can learn more that way. One of those has to do with steering wheel controls

 

Just for future reference the bottom two plugs are for a mic and the other is for steering wheel controls, anyway my car does not have either one. I installed my new radio and all is good.