hello all and thanks in advance for reading this.

i have a 1987 245 wagoon and i am struggling with the radio. the previous owner put an aftermarket radio in which he removed, jamming the stock cr-712 back in the hole. he obviously rivaled marconi with his electrical prowess, as he replaced the speaker wires with extension cord and spliced in bits of wires so it is almost impossible to tell what is what. on the radio itself, the plug has been cut, leaving the following assorted wires:
1.fat BLACK (ok this is ground im sure)
2.BLUE (+12v to this turns her on, so un or swithched power)
3.BLUE/WHITE STRIPE (speaker + i think)
4.WHITE/BLUE STRIPE (nother speaker +)

can anybody tell me what the following colors are???
5. GREY
6. RED
7. ORANGE
8. GREEN
9. BROWN
10. YELLOW

any help at all is GREATLY appreciated. also, please i need what goes TO them, as i said the stock colors are no longer in place in the harness of the car.