I have a Mk1 Orion 1984 model. I still have the factory stereo, the green digital with cassette player which I intend to replace. Now this is the wiring I found at the back. All of them are connected to a plug which then inserts at the back of the stereo.


-I have the normal speaker wires which shouldn't be a problem;

-one thick yellow, should be the permanent;

-one thick red, suppose the ignition;

-one thick brown and another thicker brown wire connected together;

-white/brown which is connected to nothing

-the aerial plug, which has a thin red wire inserted in it too (the thin red wire is connected to the red ignition wire)

-and finally a grey/white wire


Now the problems are:

1)What is the thin red wire connected with the antenna plug?

2)What are the two brown wires? If the thick one is the earth, what's the other one? Which one should I connect to the earth of my new stereo? Because on the stereo manual it says that the earth should be connected to a metal part of the car and not the battery earth...

3)What is the grey/white wire? Could it be the one that connects the stereo with the lighting of the car? Because when I turn on the car lights, the stereo background & buttons used to light up green even it was switched off, so I was wondering if this wire was doing the job...

If you think you can help me, please reply to this post. Thanks a lot & cheers guys.