How do I install this in a 2003 g35 coupe? I connecting a amp and 2 subs

output it has 2 rca and a brown wire
input it has:
1 white
1 white with black stripe
1 grey
1 grey with black stripe

I know the rca go to the amp but what about the brown wire?

thanks

 

there should be a wiring diagram.
but I'm guessing it would be ground. you may not even have to hook it up.

 

I assume by now you have it hooked up. Either way.

Ignore the brown wires.
White and White with Black strip are Left input. White being postitive.
Grey and Grey with Black stripe is the Right input. Grey being the positive.

 

so the stripe wires are negative?