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just checked an old radio i had lying around and the ignition (or "on" position) wire is yellow. That might confirm it being an ignition wire.
The blue wire I'm fairly sure will be the acc wire.
Anyways, if you hook it up to a 12V source and power it up, you can probably get it to work, and just not use the rest of the wires which are most likely just accessory/ security wires.
I'm guessing the reason you have 2 ignition wires is that one senses if the ignition is on, and the other powers the ignition once you shut the car off.
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