Help 2002 Yukon denali Bose system wires cut

[jbrock1732]

I bought a 2002 Yukon Denali with th bose system in it who ever had it before cut all the wires from the stock amp. I want to just run wires from the aftermarket head unit to the speakers but can not figure out what wires are what I've look all over the web still can not figure it out does anyone know what color the wires are that go to the speakers from the amp in the back panel please and thank you