OK. The 45 second delay in booting every time I stop the car for a minute is really starting to wind me up - plus the fact that the radio starts with a hiss on 87.50, and I have to hit a favourite button manually. Small thing, I know, but there you are. Also have to manually switch the RDS/AF function on every time.
So I started thinking about swapping the wires again, and had a good look at the main loom which goes from the ISO plug to the stereo. There is no red (constant +12V) to it (blue line), though there is a small red wire to a much smaller plug which has various accessory connections... I don't know if that connects internally to the main power circuit, or not.
No matter how I configure the stereo sleep settings etc, I get the long cold boot. Do you reckon, with no red to the main plug, it simply cannot receive power with the ignition off?
If so, then swapping red & yellow is the only option, I guess
