I just whipped up this schematic and put on my photobucket.http://i1151.photobucket.com/albums/o636/bztguy/6Vto12V.png
Interesting Idea.
How big of a small battery would you use?
According to a couple guys that sometimes repair these higher wattage head units.
When 12v is applied to the accessory wire, the head units CD player, pre-amplifier and power amplifier circuits are turned on (standby mode).
The radio station presets and clock time are maintained by the YELLOW main power wire.
Its like the accessory wire is really connected internally to a voltage sensing relay that when 12v is applied is tying
the YELLOW wire to the CD player, pre-amplifier and power amplifier circuits.
The YELLOW main power wire is hardwired into the microprocessors that maintain clock time and radio station presets. (Unswitched)
The accessory wire has nothing to do with maintaining clock time and radio station presets.
I guess you could put the relay contact on the accessory wire, rather than the main power wire.
