Originally Posted by
Julies Cool F1
The radio has to be completely insulated from any other metal contact, then hooked up with dedicated power and ground wires. It makes the case "hot" in a negatively grounded truck.
In addition to the power and ground wires. you would have to isolate your antenna from the car body. (I did this back in the '70's on a British Hillman I owned...back when I had more brain cells but less knowledge.)
I don't know for sure, but I think the lack of a good ground would open up the possibility of RF interference (alternator whine, etc).
Best not do it.