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You know, out of the entire FAQ "Car installation questions" section, that's the one article that I didn't read. Since every installer I called refused to touch it, I assumed that article didn't apply. Thanks for the link.

Well, since it specifically said to go to Crutchfield or a stereo store, and you said that they wouldn't touch it, it kinda doesn't apply. I just wanted to re-iterate my opinion about not guessing at the wiring functions.

I mean, you might be able to tell what some of the wires do with a voltmeter, but not all of them. For instance, maybe a data signal line would appear to carry 12 volts when the ignition is on, but that wouldn't mean it should be hooked up to the empeg's ignition sense wire. :-)

Eventually, though, if you keep looking, you're going to find someone somewhere who's already got the specs on the wiring or who can do better reverse-engineering than just making guesses with a voltmeter. I'd take Mark up on his offer.