Put dis in the ICE section and ull get more responses 8)
Usually teh power cable is run on a seperate side to the audio cable to your amp to avoid crosstalk.
In my case the power cable is run securely under the car because of its size.
Although before i had this in my astra the power was run on the passenger side because the battery in the engine is on that side and the firewall hole to put the cable through was also on that side.
If your gettin indicator noise comin through, that sounds pretty bad.
Which audio installer are you dealing with, sounds like a Strathfield Car Radios professional install (sarcasm).
Hope that helps!