Upgrading old radio

[gordonpond]

We have a 1998 Dolphin with the original Audiovox radio with casette player in it that's no longer working well. I'm trying to replace it with a new "Dual" HD radio with CD player and discovered quickly that the wiring harness that's in the RV doesn't match the new radio plug in (of course). I called a company that makes wiring harness adapter plugs about one to match the old with the new and they said that the RV radio system was using a "floating ground" and that the old speakers in the ceiling would have to be replaced with regular wiring (no problem) and the system rewired for a normal ground - that's the problem.

Does anyone have any experience doing this? I'm a retired senior computer scientist and understand basic electronics and could do this myself if told how.

[Theberrys]

I replaced the bedroom radio in my 99 Tradewinds, pictures here, http://cid-ae67fff392766057.photos.l...adio%20Upgrade and the hum was awful. Also when I routed the front TV Audio through the Dash Radio I had the same problem. I used one of these in both locations and the problem was solved. A lot easier than re-wiring everything.
http://www.amazon.com/Raptor-GL15-Ground-Loop-Isolator/dp/B0009O19LQ/ref=sr_1_11?ie=UTF8&s=automotive&qid=1282607652&sr =8-11

I still have the old one and it works if you would like it just ask. http://cid-ae67fff392766057.photos.l...ovix%20AWM-524

Dick