My very old CD player doens't run and I purchased a new one. But after I installed the new one, it still doesn't work. Finally, I found that the dash wire harness connecting CD has some problem. I used multi-meter to measure the voltage of the power wire (red one) and it's zero. The battery wire (yellow one) is ok, 12v. So now my new CD Player can only load/unload CD but cannot play.

Does anyone has the experience for the replacement of the cord and harness? Any suggestions will be very helpful.

Thanks.