Electrical issues after rear end, several

I never would of thought it would of been the issue. It’s no worse than a radar detector or gps etc being hooked up, and when working doesn’t draw any power but to keep the screen on, and relays info back n forth on the ecu to make it self drive… nothing that should blow fuses etc, unless of course you have a short lol. But I’m quite shocked it has an internal shock and never would of known it until it smoked like it did… otherwise it would still be a mystery