Yaesu FT400 doesn’t really shut off

[kcjaz]

That'll depend on the specific OBD-II dongle. I have a wireless one permanently plugged in that has a sleep function so barely draws anything.

yes. pretty sure mine doesn't draw any power unless the head unit is on which requires the ignition to be on. I've had it installed for a few years now and I haven't had dead batteries.

https://www.amazon.com/gp/product/B005ZWM0R4/?tag=ihco-20