The radio is grounding through the antenna connection. Unplug the antenna and see that it will stop. However you still need to hook up the ground 1st and the antenna last.
The stereo is wired wrong. In this case it sounds like the ground wire of the stereo is hooked to the dimmer circuit. The ground wire of the stereo should be connected to the vehicle chassis.
No it doesn't. The acc wire on your stereo is for accessory from your ignition switch. That's so you can turn your car key back and run your stereo without turning on the engine.
If your connecting a stereo, it's always best to ground directly to the negative side of the battery: however you can connect to a ground under the dash also. Some autos have a ground block at the fuse panel that can also be used but you will need a spade connector. your cars body is the ground.connect the stereo ground to a metal part of the car,leave the battery connected to a ground,engine should also be connected to a ground
black
ground is the black...
you have a ground loop, use a ground loop isolator to get rid of it.
Without
Try temporally disconnecting the ground cable off the battery, the stereo may reset itself and spit out the disc.
I'm guessing your stereo is aftermarket. If so, then whoever installed it did it wrong or tried something tricky.
When you enter the security code wrong on a Citroen Saxo car stereo, it will display an error. If error 9 is displayed on your stereo, you have entered the wrong code nine times and your system is blocked. You will have to wait to enter the code correctly.
Yellow and black
sounds like a bad ground