1995 240sx speaker wiring

[hpmachine]

I'm just trying to get a cheap HU installed with the factory speakers. I'm confused because there are 2 sets of pink and blue wires in the factory harness. One pair goes to the right rear speaker and pink is neg. The other pair goes to front left speaker and blue is neg. How can I tell which one goes where? Also on my new HU, there is no 'amp on' wire. (light green/red stripe) on the factory harness. How do I get that to work? Obviously I'm noob at this. lol Thanks

[the converted]

This is what you should have for wiring at the head unit.

Left Front Speaker (+): Blue/WhiteLeft Front Speaker (-): Blue/YellowRight Front Speaker (+): BrownRight Front Speaker (-): Brown/WhiteLeft Rear Speaker (+): RedLeft Rear Speaker (-): GreenRight Rear Speaker (+): BlueRight Rear Speaker (-): Pink

As for the amp turn on, I'm going to assume that there is a blue wire on the deck for antenna that you can hook up. I'm assuming that your bypassing any of the amps that might be in the car, so you shouldn't have any need for it anyway.