1. I understand that they need some altering to 'wake up' the main power supply, so does this mean that the PSU would be unable to supply a low-current 12 volt supply to the accessory supply to maintain radio tuner memory, etc?
2. How much power do these PSUs draw when they are supplying nothing to whatever they are connected? Being a switched mode unit, I understand that they have a constant draw of power.
My understandings, of course, may be wrong.
Last idea is to run the car stereo from a small lead acid battery (which I already have, so no cost involved) and to connect a small trickle charger to the battery to keep it topped up. Any comments on this idea?
Thanks very much for any helpful info you can give me.