Can you help with a problem I have in fitting a CD player to sons car

Hi. I bought a renault clio biarritz 1997 for my son lately and he bought an alba cd player to use in it. I have a limited knowledge of electrics but here goes. From the back of the cd player is a constant live/ switch live / negative and power ariel (which he doesnt have). From the car is a black and green/red/yellow and grey and a yellow and grey and yellow and green twisted together. I believe the wiring should be black and green to black, (negative) yellow and grey to red (switch live) red to yellow (constant live) and nothing to power ariel. This leaves the yellow and grey and yellow and green wires surplus. I have fitted as described but when I turn player on it comes on goes to aux and then swithches itself off. I have put tester or red and it shows 12v constant but no reading coming from yellow and grey (switched live while car off or even when I turn ignition on). No readings from surplus wires. Seems like no feed coming from switched live but would like to know if this is correct and what to do if its not. KIDS! Should have bought him a ped lol. Thanks Geoff