W203 stereo wiring

[nurple]

Just after a confirmation really.

Im fitting an aftermarket radio to my pre facelift W203 and on the original ISO block there only seems to be a switched live (which drops out a couple of mins after the ignition key is removed)

Is this correct?

Most aftermarket radios have a permanent live and a switched live (so the station memory and other settings are kept)

I have no problem running a new permanent live back to the battery (in fact Id prefer to so the head unit gets a nice clean supply and a decent gauge of cable)

Just wondered if its the same on everyone elses?

Ta.

 

[npuk]

Normally only a permanent live so you have to wire in a switched live, most people take one from the cigarette lighter.

 

[nurple]

Yeah, I did this but the permanent live seems to drop away after 5 mins or so.
My Heaudunit is an older Blaupunkt (New York RDM127) and each time I have to start a fresh from the set up menu.
Ive done a bit of reading and understand that the CANbus wakes the standard Mercedes radio which makes sense
will have another look at weekend

Thanks for the response