I just installed my first system and I had problems determining the polarity of the stock wires. I used the stock wires for speaker level inputs on my amp since my HU has only one set of preamps.

Front right: I think I got these right since only one was striped. I assumed the striped one was (-)

Front left: there is a blue wire with a white stripe and a blue wire with a yellow stripe. I assumed the one with the yellow stripe was (+).

Back speakers: One speaker had a red wire which I assumed was (+). On the other peaker there was a pink wire?

If anyone knows which wire is which it would be greatly appreciated. The system sounds tight right now but I just want to make sure every speaker is helping the cause.

 

Go to http://www.installdr.com for the exact colour for the wires. I used them when installing my system and it really helped a lot.