At 08:47 AM 2/24/2009, Dug Smith wrote...

>No need - I wired up a switch for the stereo to get around it :o)

Ditto. With a couple of small signal diodes (1N4148 or similar, 50 of
them for a couple of bucks at Radio Shack), it can be wired to come on
with _either_ the switch or the ignition, so you don't have to manually
switch it on after starting the van.

                 diode  switch
constant +12 ---->|------/ ---|
                               |---- radio switched lead
                 diode         |
terminal 15 ----->|-----------|

As long as the diodes are close to the power supply, there's no need
for any fuses, a small signal diode will blow before any fuse would.