Actually some of the newer aftermarket stereos have internal switch
controls that minimize power draw, but can sometimes allow excessive
currents. The CSS stereo I have when switched off, and still connected
to constant +12V, draws about 35mA. I think most of that is the display
backlight, which turns off when I remove power completely. The CSS
stereo does keep memory settings for quite a while with power off, about
2 weeks or so.
Jon

On 9/1/2015 3:57 PM, David Beierl wrote:
> At 04:28 PM 9/1/2015, Alistair Bell wrote:
>> This subject is becoming a perennial favourite in the list. I
>> measured the current draw of my stereo head unit. It was something
>> like 130mA turned off, but face plate on. And only 30 or so mA
>> turned off with the face plate off. Faceplate off current draw was
>> low enough to for me to accept, I take the face plate off if not
>> driving the van for a few days.
>
> That's nutty.  Whatever happened to OFF?  Memory keepalive should be
> zero draw.
>
> Yrs,
> d