Audio Systems: CD Instalation, marker pen, cheap as chips

Question
I have had an original CD player fitted and it has gone haywire. Radio stops and a buzzing noise starts when you turn on the lights. The buzzing remains even if I remove the fuse. Is the player a dud do you think or has it been wired in wrongly.
Thanks

Answer
Just too much problem with too little info. I have put my standard text below and if you follow that then you will eliminate any problems with the wiring and that just leaves 'the radio' gasp! They are as cheap as chips theses days so it wouldn't break the bank to stuff a new one in but ONLY after you have checked out and illiminated any wiring faults, good luck, Peter


Basic test and diagnostic procedure for car wiring harness.

You will need the following;

A test meter set at 20vdc or a test lamp (two wires on a 12v bulb) or probe (like a screwdriver with a 12v bulb in it and a lead and clip)
Some masking or paper tape to label wires and a marker pen,
An “AA” or “AAA” torch battery, (or borrow one out of the TV remote for an hour)

First the easy stuff, the speakers, (without amp!)

Speaker wires.
These are normally twisted together in pairs if you are lucky and are the same colour for each pair but one with a colour trace on, i.e. blue and blue/white, green and green/white. Touch a pair across the battery and you will hear a noise on the corresponding speaker, label it (e.g. left rear), continue until all four are identified and labelled.

Power leads connector.
Earth one side of your meter or tester to a metal part of the car, probe each wire until you have a wire that is live all the time with the ignition OFF, label this ‘+30’.
Switch on ignition and redo test until you find another previously dead wire now live, this is ‘+15’.
Switch off ignition and switch on the side / park lights, repeat test until you find a third live, label this ‘lights’. Switch off the lights.
You should now have two or three left. One will be earth, (usually black or brown); one could be to an amp and or electric ariel (usually blue or blue white) and one for phone mute if fitted. Clip tester to +30 and probe one of the remaining wires, if you have an electric ariel it will go up. Connect your DIN plug to the correct wires and jobs a good un’.

DIN connections are.

Speakers

Right rear -,  right front -,   left front -,  left rear-,
Right rear +, Right front +, left front +, left rear +

Power block viewed from cable side

Phone mute (white),/   n/c, /      ariel & amp (blue), /ignition (red)

N/c, / 12vlive, (yellow or orange), / lights, (various colours),/ negative (black)

Hope that helps, Peter