All I did, was to wire both power wires to an always "hot" lead, and put a toggle switch on the "accessory igntion" one.
Easiest solution...

Tom

>Subject: stereo wiring
>   From: Dan Barrett <dan@OFFTHEHILL.ORG>
>   Date: Mon, 10 Jun 2002 02:18:03 -0400
>     To: vanagon@GERRY.VANAGON.COM
>
>Volks,
>  I'm putting a new stereo system in Mudskipper.  Thanks to my multimeter,
>  and a new box of 15 amp fuses (doh!), I've located the battery lead, but
>  it appears to be always hot.  The head unit I've purchased (Pioneer
>  DEH-P4400) has two power inputs: one for the "terminal always supplied
>  with power regardless of ignition position" and one for the "terminal
>  controlled by the ignition switch."   I figured, hey European cars are always wired hot, there is no
>   "accessory" ignition position, but the DEH-P4400 manual cautions
>   thusly: "the red lead should be connected to a terminal coupled with
>   ignition ON/OFF operations.  If this is not done, the vehicle battery
>   may be drained when you are away from the vehicle . . ."   Does this mysterious lead ring any bells?  The Bentley diagram is a
>   little confusing.
>Many thanks,
>d.
>1990 GL -- "Mudskipper"