Re: Installing CB Radio
As you said, the black is obviously ground. Red is most likely where you want to put your +12VDC. The orange maybe something for the lights so they dim when you turn your headlights on. I don't know, but that's a possibility. As for connecting it up so that it comes on with the ignition, the easiest way to do that is to take the fuse panel/bottom of the steering column cover off. Then, using a voltmeter or test light, connect one end to a decent ground, and search around until you find something that only has power on it when the key is on.
Unless your unit is really high powered, you probably don't need to worry too much about blowing the fuses in whatever circuit you connect it to. At the same time, if you connect it to something and it blows the fuse, you'll obviously know that you need to try something else.
For mine, I just poked around in there until I found something convenient and used it. It seems to work fine. One thing to watch for that could be handy is connectors that have nothing connected to them, like for an option that isn't on the car. They may have power on them when the key is on, and in that case, it will be really easy.
Sorry for being so long winded, but I hope it's of some help to you.
Nathan in MN (now in MI for college)