Doofy

Ive always switched earth in the cars ive had in the past when putting a switch in line for something,, Just that when plugging the aerial in the back of unit it uses that as an earth.

Changed the standard stream HU a while back for the Bolero, Didn't change the can bus (too much faff), Is there anything i can do apart from keep pulling the radio fuse so i don't end up with a flat battery. Like i say don't want to replace the can bus because of sourcing a correct one and cost. Already tried switching the earth wire to the radio which doesn't work...Thanks..