Think about the throttle pot. It's often sitting in a metal housing having contact to motor block. Here you can use a shielded cable and connect shield to chassis at both ends. Many other sensors are also sitting in flanges near the motor having electrical contact with it. ABS sensors are mounted near the chassis, etc. etc.

Of course the car must be prepared to connect the shield at both ends to chassis. Also, in older cars, which do not have much electronics this shielding isn't necessary, because there's nothing that can be interfered.


Yes, of course, for saftey reasons, when one side is lifted to a dangerous potential, or if total isolation is needed for other reasons.


Yes, but they don't forbid it for very high resolution converters. They say, that in most cases, where no high resolution converteres are used, the solid ground plane will lead to better results than when an unexperienced router tries to split the ground plane.


I thought we are discussing about cars here?

Some years ago, there was a phenomenon described in the press: Some modern cars like Opel Omega, Ford Focus and some others showed strange behaviour from time to time: From one moment to the other the whole electronics stoped working properly and the engine went off. This was often obeserved, when the car entered a tunnel! I have a friend who happened this.

Or a certain car had always the motor going off, when stopping at a certain traffic light.

Have a look at the "banana skins" of compliance-club for more examples!

It turned out, that these cars, which were brand-new cars, were susceptible against radiation of very short wavelengths, for instance cellphone radiation, but also other traffic control signal transmissions, e.g. to traffic lights.

You are right of course, connecting the shield at both ends of only one such cable makes no sense, because then an unsane ground loop can develop. But if you do it with all your cables, then you get soemthing like a ground mesh, where the effective ground loop areas are minimized and by this the ground noise.

Only what I want to tell here is, that it becomes more and more demanding to connect the shield to ground at both ends, just to get a satisfying shielding performance in a world more and more becoming contaminated by highest frequency radiation. Whether Mahmood must adopt this or not depends on his setup, from which we do not know anything concrete.

Kai