Thanks.
Yes cig socket is on all the time, but battery seems to cope OK. I would unplug if I was parked at the airport etc... but car is used at least 5 times a week.
I will make a switched supply one day as per the video on dognmonkey.com website.
I might try one of those isolators but in theory, they should reduce the audio quality a bit. I'll post back if/when i do.
Last edited by snapdragon; 25th June 2018 at 10:18 AM.
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