my friend dropped off this head unit that looks like its from a boat but it was in his paseo. Its got four wires in a group and then one grounding wire. the wires coming out are green, red (with fuse) gray, black, and the other black ground wire. Is there any way to hook this up without buying a converter harness? I cant see how to rig this thing to hit all four speakers. I imagine just run the speaker cables from it to all four speakers but thats all I could devise. I dont really want to use this but Im broke and I need some AM/FM action. I just have a neat hole where my stereo should be. If this is going to be a huge pain im just going to wait until i get a stock radio. I dont want to waste time effort and money on a new headunit when it will just get stolen.

nvm i get it. one wire is for left speaker and provide grounding for it, the other for right and so on.. needless to say im not using this dated equipment...