I got my dash out, and I got a roll of copper tape. I was going to shield the CAS signal wire, but was curious whether there are any other wires that needs to be shielded?

also, would shielding alternator 12v power wire going to battery (which I have running parallel to bunch of sensor wires) help? I understand the concept of shielding sensor wires, but I wonder if putting the faraday cage around the 12v power wire would prevent magnetic field around the high current 12v alternator wire (which is in very close proximity to bunch of sensor wires) from interfering with sensor wires. I can't get to all the sensor wires because they are in very difficult positions. It was pain just to dig up the CAS wire... I was curious whether putting the faraday cage around the power wire would help interference.

 

you are wasting your time, you should worry about the actual wire failing (breakage) than it's having interference.

 

well my setup is little different from the stock rx8. I have my alternator wire spliced from main wire going to trunk running through firewall next to bunch of sensor wires.

I only noticed it because I noticed that the car idled roughly with alternator on and smoother with alternator off. I don't think it's the load of the alternator although i guess it could be... the car's otherwise working fine, so I don't think anything's frayed or disconnected.