Glad you are happy with your results. I have seen good noise isolation with a ground loop isolator as well, I just have to convince myself that the response is not being degraded. Perhaps your PAC isolator is doing a better job than my Radio Shack isolator (likely the case)!

Sounds like you found the same ground point that I did, just on the passenger side instead of the driver's side.

Thanks for all the help and advice.

Lynn